The animation, both style and quality, was the first thing I noticed that drew me to keep watching it. The OP/ED, and BGM are great as well (OP especially). The character design is really well done, it's not too excessive, but very stylish.
My gripe with this show is the ending episodes. As a fan of the manga, it was pretty saddening to see them say 'f... you' to the cannon, and do it badly enough that almost all the reviews I have read say the ending sucks, or is unsatisfying. I really hope they pull a Hayate, and start a new season where the old one split off rather than at the non-cannon... See full review