Well, put it this way, Ashes of Love has the highest rating among all Fantasy cdramas in the last ten years on Douban, 7.3/10 from over 120k users. If you know how picky Douban users are, most of above dramas you mentioned did not even reach 6. The best is Ten Miles, 6.7/10.
General thoughts about cons:
1. Most viewers agree that this drama has the best CGI among all fantasy cdramas so far. For me, this totally raised the bar of my next fantasy cdrama. The ending war scene is a mind blower.
2. The pace is very good. I did not see any complains about slow starting. Most viewers were dragged in from ep1.
3. HAPPY ENDING!!!!!!!!!!!!!
Complains:
When the story comes to around ep30 or ep40, a lot of non-novel materials are added with the background story of the second male lead and the love story of second female lead. The opinions about it are extreme diverse. Some are totally fine with it. Others especially the book fans are mad about it which caused the rating on Douban dropped dramatically from the starting 7.6/10 down to current 7.3/10.
Other than that, the acting, the set, the costume, the music are all on the right spot which nearly nobody complains.
So I would say, try it if you have some time. Warning, very addictive starting. I watched nearly 13 eps non-stop.