Oh boy, this anime though...*sigh*
Story:
Where to start? I did find the first half of this very enjoyable. The flow was consistence and kept my levels of anticipation high, but once the filler arc came in... plot holes ahoy! I found myself slowly and slowly getting more bored. Things would happen that didn't make a whole lot of sense, the pace felt off, and some cliche scene came into play. I found there were references to other mangas (Bleach) and TV shows (Supernatural). The story-line was a bit overdone and cliche at that point.
Art:
I was very impressed with the animation in this. I really loved the setting and the placement of The Vatican in there. There was some really good detail especially in the main city and the Academy as well.
Sound:
I loved the first opening song. I actually downloaded it on my iPod for later use. But I didn't really like some of the music they used. It didn't quite match the scene as well as I wanted it to. It did add a bit of interest, but I just didn't get the anxious and suspenseful feeling I wanted to get.
Character:
I found a few stereotypical characters, Izumo was one of them with her snobby attitude and thinking she's better than everyone, there was also Yukio holding the litter-brother-smarter-than-the-big-brother characteristic. Shura reminded me a lot of Yoruichi from Bleach too, and almost had the same personality as her (and yes I am aware the English Dub was voice by the same actor). I didn't find much depth or development in characters either. There were a lot of static characters. Throughout the whole thing I think Shiemi was the only character that was well developed.
Enjoyment/Overall:
I'm not going to lie, this wasn't the best anime I've seen. I was quite disappointed in the end and didn't get the satisfying feeling I wanted to get. I understand the manga is very popular, but I don't think I'll pick it up. I lost interest in reading the real plot after watching this. At first, yes this was very exciting and I loved some of the scenes, but I felt like when the filler came, my whole experience was ruined. I would recommend reading the manga instead of watching the anime if you don't want to be disappointed. Other than that, I give this anime a C- or 58% on the scale.