I enjoyed this. I usually wince at anime that involves the Catholic church or a clone of it, but this time, it was done nicely. None of me saying at the screen "Oh come one, that is not done!" etc. etc. when I see it in anime.
I actually cared about the characters and what happened to them.
It was dark but had enough comedy relief to make it palatable. Had enough character development that unfolded slowly.
The villains were great.
The animation & fight scenes could have used a bit of polish but I could live with that having been given good characters and an interesting story.
I knocked off a star for another ending that is no ending. It wasn't exactly a cliff hanger but the story arc was far from resolved. Grrrr. I hate when they do that unless they have signed on the dotted line for another season.