Honestly, I don't really enjoy the story. It's fairly predictable and rather dull. It took the first season and a movie, plus 10 episodes of S2 to finally get to the stories ending, which wasn't even mentioned throughout the first season. The build-up was forever, and the fights with Shiro...Oh wait, there are none.
I still enjoy the art and OST though. It's got solid choreography in most of its fights and the music that goes with it is hype as hell.
Forgot to mention how much this show just tries to shove fujoshit down your throat. Almost every single guy is detailed towards female eyecandy. Not to say that this is a bad thing, because of how much eyecandy males get, but I don't usually watch shows centered towards that.