I'll admit that I've never read the original story, or seen the animated series, so I was going into this completely blind (basically; all I knew about the series before I watched it was all the guys have long, luxurious hair and fight each other graceful with swords whilst flying through the air... Oh, that and the fact the main two characters are in love...), but I have to say it really exceeded my expectations in many aspects!
I don't think I'm the only one who'll say that the first few episodes are a bit confusing to get into (especially when you're not familiar with the source material) which makes them drag just a little bit. But I'd say if you're feeling this way at the start, definitely try to stick with it! The story continues to get more interesting and intense, as well as things get explained as it goes on! And the characters all go through some really great development through the 50 episodes, which makes them more relatable!
As far as complaints go; my main issue is with some of the ways scenes are filmed and framed, particularly in very emotional scenes... It wasn't necessarily bad or too jarring, but it did pull you away from the immersion a little bit! The cgi isn't the best, but that's to be expected considering this didn't have a massive budget... It wasn't too bad to pull you out of the story, though, so I'd say it wasn't too big of an issue!
The biggest thing I'll commend the series on is something I imagine everyone has already said: that being the handling of the relationship between characters, particularly the main two! It's no secret that this is based on an lgbt ('bl') novel, and that China have strict censorship laws that don't allow depictions of that on screen. However, the producers and scriptwriters really were able to develop a believable and touching dynamic between the two main characters throughout the span of the series in subtle and well done ways! And more than that, the other friendships and relationships of the series were made believable and touching too!
Overall; it's an emotionally invested and well made drama, with some pretty decent acting on the most part and a bunch of really engaging and interesting characters!