Most of the other reviewers seem to have really liked The Rebel Princess, which is great, but I thought I'd offer a different perspective since I ended up being very underwhelmed by this drama even though I really wanted to like it. Keep in mind that my c-drama experience is limited (this was my 21st one) and I'm not familiar with the source material of this drama. Also, I watch dramas mostly for the romance.

Positives:

+ really nice set design, costuming and lighting, which made the drama feel more realistic and quite refreshing after all the wuxia dramas
+ shot well
+ A'Wu and Xiao Qi were smart and nice and respected each other
+ the acting was fine

Negatives:

- another reviewer suggested that this drama should be watched for the slow burn romance, but I thought the romance wasn't that much of a slow burn and the main couple ended up together quite fast all things considered
- I was mostly invested in the main pair's relationship during the first ~15 episodes, after that their relationship stayed pretty much the same throughout the rest of the drama, which would've been fine had their dynamic been more interesting. And no, I don't mean that I wanted to see a drama-filled tumultuous relationship, I just wanted the drama to explore more in-depth why the two characters loved each other and what made them a great team. Now I just got the feeling that they were together because they were literally the only two equally powerful good people in the show that liked each other well enough. Actually A'Wu and Xiao Qi were mostly in separate places during the show, which might have been technically realistic but also very frustrating if you're in it for the romance.
- the drama was way too long considering how little happened in it
- there was a heavy emphasis on political scheming, which I'm never a big fan of but this time around it was somehow especially boring
- most of the characters were unlikeable and/or uninteresting
- the characters who did bad things during the story didn't get punished either at all or at least not in a satisfying way
- like in some other dramas I've seen, there was an overemphasis on forgiving absolutely everything because fAmILy and bEinG a gOOd pERsOn, which at this point is one of my biggest pet peeves
- rape and the threat of rape was used as a plot device at two different parts of the drama, and in my opinion it wasn't handled very well
- I spent most of the drama just waiting for something interesting to happen
- normally I dislike unhappy endings but now I was low key waiting for someone to die because at least that would've been vaguely interesting
- okay actually I was so unattached to the characters that even if they had all died I would've been like "huh, okay" and moved on


Watch if you enjoy:

- more realistic historical dramas
- political scheming
- heavy emphasis on side characters
- forgiving people who don't necessarily deserve it
- slow story progression
- emphasis on other aspects of life besides romance

Don't watch if you're looking for:

- a plot-heavy story
- surprising plot developments
- strong character development all throughout the story
- in-depth romance
- frequent interaction between the main pair
- revenge plot