Off the bat: Moorim School has similar feels to X-men sometimes, but without *everyone* having special powers (instead, everyone is trained in martial arts).

Moorim School started pretty well, but as the drama continued, is suffered from pacing issues, which made it hard for me to stay engaged with the drama. There were some really cool action sequences, but then there would be really boring, draggy bits where the plot progressed really slowly. >.<

While I enjoyed the overall plot of the story, I have some critiques. I personally feel that the actors look too old for their roles as young college students. I also found the rehabilitation for Chae Yoon was unrealistic and too fast. I really didn't like the new villain trainer actress towards the very end of the drama, played by Kil Hae Yeon; I like the actress in other dramas (such as My Fellow Citizens), but I did not like how she portrayed her villainess character in this role.
Personally the biggest downfall to this drama is how Chi Ang was portrayed in the end - I don't like how Chi Ang turned into such a pathetic guy. While his growth could be argued as logical and realistic, I just didn't like the progression of his character and his dynamics with the other characters as a result of his "growth". On that note, it is not well portrayed as to how and why Si Woo has such a close relationship with Chi Ang when they didn't really have a long or in-depth friendship. The story spent so much time with them fighting and being "enemies" that I just don't see why Si Woo is so attached to Chi Ang as a "best" friend (and no, the general, "Si Woo is a good person and cares about Chi Ang" is not a sufficient explanation).

While I have a lot of criticisms, I did overall generally enjoy the drama. It has a great epilogue and it's a happy ending. Would I rewatch it? No. Would I recommend it? No, probably not. But I might listen to some OSTs from this drama since they were very enjoyable.