It's not as good as FMA:B in my opinion, but damn close. It's really funny, and you get attached to it way more emotionally than FMA:B.
Without giving out too many spoilers: It's about people who lived horrible lives who want revenge for God making their lives unfair. They're in some kind of afterlife, where everyone's immortal, and they fight a girl they call Angel, as they believe her to be God's guardian of the place. Her job would be to make them disappear and be reincarnated as something else, something they refuse to, as they aren't satisfied with their lives a all. One disappears when they accept the situation.
And then there are some turns and stuff :P