Ao no Exorcist has some interesting ideas though not all of them fulfill their potential. There is a lot of enjoyment to be had here and if you're thinking about reading it I think it's definitely worth a shot even if some of the story arcs aren't as exciting as others there are still a lot of memorable moments and twists along the way, some really cool characters and fights. Especially if you're into plots that revolve around demons and exorcism.