When I initially came upon Ancient Love Poetry, it was being slammed from all sides, but I still decided to watch it for some reason.
Now, 49 episodes later, it has blown my expectations and is perhaps one of the best dramas out there in my list. The unique storyline, outstanding performances by the entire cast, numerous lovable characters, villains that make your blood boil, suspenses that leave you worried along with numerous tales of sincerity and undying love completely bewitched me. I'm so glad that I didn't pay heed to all the negative reviews and kept going. Bear with me, my review will be long and I have tried covering a few points that might put off many viewers and the things I loved about this drama. I hope that it convinces you to give it a chance:

1. Don't be fooled by the bland beginning. Ancient Love Poetry has one of the most unique storylines I've seen. And they did not kid around with the title "Ancient God". The story takes place waaay before the existence of humans. In the God Realm - where our lazy female lead, Shangu, is forcefully pushed to master the Power of Chaos in a race against time to stop the Tribulation of Chaos and also protect the Three Realms as the power that protects it begin to dissipate, something which only she had the ability to permanently solve. Her master happens to be Bai Jue, one of the True Gods, who is rather cold and strict towards her, but slowly warms upto her rather humble nature, eventually falling deeply for her. Her hardwork pays off, but the tribulation turns out to be her ultimate test which no one is able to stop. But, destiny has more in store for her....
The story is also the most strongest point of Ancient Love Poetry. It delves away from the Heavenly Realm, focussing on the life of the Ancient Gods, the most powerful beings across all Realms, which was a first for me. The events and mysteries unravel in a rather ominous and nerve wracking manner. I paused an episode and decided to spoil myself as I couldn't handle anymore surprises that were often accompanied by painful experiences. The plot purposefully takes a drastic turn after a certain point, but it did not feel disconnected and maintained the right flow. The chronological way of narration is done right in Ancient Love Poetry - it might have been shot that way to avoid unnecessary flashbacks to the past and helps us connect with their present selves better.
[The author of the novel, Xing Ling herself was involved as a screen writer. While the story does deviate from the original work at times, it stays true to the novel for several major plot points. And the script is well plotted despite having some issues at the beginning, but that was necessary for the plot.]

2. The timeline - is a MAJOR factor that no one probably notices. A single episode may consist of several days or even months, hence the romance is pretty fast paced. Right from EP1, it's implied that several days/weeks had passed. Three months and 1000 years, all pass within two episodes. Shangu's training might have taken months or years, but we see glimpses of it. This might be off putting for many, but I personally was not bothered by it. The actors played the roles really well and nothing felt rushes.

3. The characters, particularly the leads and even the supporting ones are the pillars of the whole story. Get ready for an emotional rollercoaster.
The Female lead is very unlike the ones we usually see - she is not stunningly pretty or the typical Goddess type. While she might not be everyone's cup of tea, I think she is beautiful and was the smartest choice out of the cast to be chosen to portray the young, innocent Shangu who grew up to become someone who was wise enough to hold the title of the "Chief God". I had begun watching ALP for the lead - Zhou Dong Yu is well known for her acting skills in movies, but I can tell that she brought justice to her character here just like she did for her other roles. She managed to portray the duality of Hou Chi and Shangu beautifully. I missed her smile as Shangu and I don't think anyone could have played that role and still managed to maintain a smooth balance between emotions.
I loved Xu Kai's role as Bai Jue. I think most people have seen him before in his previous works where he played lighter characters, but its good to see him in something new. As for stereotypes and how comfortable we are with the actors, its upto you, reader.
The supporting characters, I have to mention, left a deep impression on me. Particularly in EP15. Even the ones that had only a few minutes of screentime managed to convey the emotions perfectly. Characters like Gu Jun (a flood dragon who ascends to the God Realm), Tian Qi (a noteworthy, naughty True God of Demons and the one who brought Shangu up), Yuemi (Tian Qi's closest friend who spoils Shangu with him) , Zihan, Hongri... all manage to steal our attention. They were very well portrayed and I'm sure that I'll never forget any of them anytime soon and will definitely be looking forward to their future works.

4. The romance... has a more "natural" feeling, particularly for Shangu and Bai Jue. Their relationship is not forced, even if it seems rushed. Ancient Love Poetry is not heavy on physical display of affections, but their sincerity towards each other is completely driven by their actions. There are no declarations of love or confessions, but their actions are strong and silent enough to convey the depth of their devotion to each other. When the second arc begins, we see a whole new side of the "fire and ice" relation of the Gods. This change is particularly delightful as we get to see the "Ice Cube" be warm and talkative while the "Bubbly and strong" Shangu becomes the meek and powerless Hou Chi. Their story in the second arc is particularly well written with plot twists, villains and schemes that puts them against the Immortal Realm.
The romance is not just for the leads. Two supporting characters in particular, had, good solid relationships that managed to make me root for their happiness. They might have not had enough screentime, but were beautifully portrayed with such intensity that many of us wished for their happiness. The plus side was that no one imposed themselves on the one they care about, but accepted their choices and supported them, never once becoming an ill wisher. (In short, no serious love triangles.)
There are several other memorable relationships, may it be between the Gods and their Divine Beasts or just plain loyalty and friendship between each other. The God Realm arc might be a bit unsatisfying to many, but I yearned for those precious moments and missed the characters from the first arc terribly during the second one. The bromance between the Four True Gods, Yuemi and Shangu are noteworthy. While the second arc might be serious, we have several supporting characters such and Fengran, Chang Que , Jingjian and Jia Ye who lighten up the mood for Hou Chi and Qingmu as well as for us. Their banter and loyalty to their friends was constant throughout the drama. It's worth watching even if its just for them.

5. The Antagonist: That's one major question. From my perspective, it has two. An intangible entity that can not be stopped and an actual vile villain.
What sets this drama apart for me is that the 'villain' is not introduced as such. Rather, the seeds of what lies ahead are already planted in the earlier episodes and we see the gradual transition to the current state. Driven by covetous intentions, the disgusting actions and motives sets them aside from the ones I've seen. And the absolutely stunning portrayal by the actor alleviated the character to such a level that we are beyond disgusted whenever the person appears on screen. Not to mention, the character was an actual crook, who was cunning and clever. Never have I wished for a character to stop breathing as much as I did for this one. Whenever the abode of the 'evil one' appeared, I wished that the episode would move faster and go back to the locations where I feel calm enough to watch.
As for the former antagonist I mentioned... watching the drama might give you a better idea about why I mentioned it.

6. The CGI is hands down the best one I've seen to date in a major xianxia drama. It doesn't lack in intense action scenes too. One thing I noted was that most of the Gods and Immortals used a mixture of both magic and weapons in a combat, which is the first time I saw such excessive use of CGI. I was impressed with the God Realm in particular. As I mentioned in my earlier review: The make up and costumes compliment the scenery so well that each shot seems to have been spun from dreams.
While the costumes may lack in colour (something minor, but that may put off a lot of viewers), the production team went so far as to visit historical sites and attempt to weave the details into them.

7. The OST: I suck at evaluating music, but the song "Perseverance" is heartbreaking, even without the scene. I get goosebumps whenever I listen to it. Many of the BGMs were my favorite. The lighter fun music during the initial arc were really memorable, but turned to nostalgia inducing everytime I heard it in the second arc.

8. The Finale: As a hint, the drama ends exactly like the novel. I loved how the writers managed to provide closure to two storylines in 49 episodes. I, for one, am left with a bittersweet feeling of parting with my favorite characters. I grew to care for many of them, both major and minor ones. (Special mention to Sen Yu, Chang Qin, Chang Que and Jia Ye, Hongri, the Gods of God Realm, Puhua.)

All in all, I'm glad I picked up this drama while it was being avalanched by negative reviews. (There were some with valid criticism, but 80% of the CNets slammed it just for the actress's looks and the ratings and general reviews almost made it seem like an unwatchable atrocity.) I have to warn though, it might not be your cup of tea. In the end, it depends on preference. I usually drop dramas within the first five episodes, but this one being a Xianxia, I had to give it a go for some more.
Does it deserve a 10? Maybe not. (I knocked off a .5 from the Rewatch value cause the pain is real. But, this is the second CDrama that I did not drop this year and one of the best in terms of cast and story as a whole. And based on it's quality and storyline, it deserves a better rating albeit its faults. Watching it was a truly delightful experience. It made me go through a roller coaster of emotions. We see multiple hardships and sacrifices being made by people for the ones they care about. Almost every character was memorable in their own ways, even the bad guys.
And I certainly will not be forgetting the Legend of ShangGu and Bai Jue anytime soon.
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I left my first impression/review below as a memory. :)
June 20, 2021: The major drawback of Chinese Dramaland is the predictability of storylines and the numerous over used tropes that pop up as a result of it, particularly for Xianxia and Wuxia genres. Which is why it is hard to find something that captures my attention.

One of 2021's highly anticipated xianxia dramas, Ancient Love Poetry follows the progress and growth of our Goddess of Chaos - Shangu. I have to admit, I needed three episodes for the drama to finally pique my interest. The rather slow and uninteresting first episode, coupled with the carefree attitude of the female lead who is still unaware of what lies ahead is jarring for viewers looking for a fast paced drama. I have to note, the MDL synopsis seems to spoil the furure of the plot, but gives enough hint to know what trials the happy-go-lucky Shangu is yet to face. I have not seen anything yet and I'm on EP6 at the time of writing this review.
Zhou Dongyu nails her role... if the character Shangu is whom I perceive her to be - she is not dumb or stupid, but had been pampered for too long and shielded from evil by Zhiyang and Tianqu (two amusing Gods) until they are left with no choice but to ask their fellow God Bai Jue, who had retired to the lower real, to return to train Shangu as she would soon have to bear the task of protecting the dangerously thinning barrier between the Nether world and the other realms.
Xu Kai fits his role as Bai Jue, the cold God of War and his performance is convincing enough to know the power and grace he wields.
The slow moving tale (as of EP6) has scattered several hints of what lay ahead and I am curious to know how the legend of Shangu and Bai Jue come to conclusion.
The romance is... 'natural'. I have no other words to describe it. It's not mushy or cringeworthy, but there's something real about their interactions which are the highlights of the first few episodes.
Another strong point: usually the VFX of CDramas make me frown. This drama exceeds expectations. Taking place completely in the God Realm, the CGI is top notch and can be on par with many Hollywood productions. The make up and costumes compliment the scenery so well that each shot seems to have been spun from dreams.
Rather light colored without being flamboyant, the costumes are surprisingly stunning. The make up doesn't look too bright, but just good enough without being overbearing. Most of the "supernatural aura" is carried by the actors' performance. None of them disappointed me as of now.
I will rate this an 8/10 as of now. I recommend that you check it out for atleast three episodes before deciding to drop this. Long Chinese dramas often have a slow start. So far, this is one of the better hyped up fantasy dramas Tencent rolled out this year for me. Now, I'll wait to see if this one can leave a remarkable impression in Xianxia land to stand the test of time...