I honestly don't know what to think about Brian Azzarello. He does great gritty crimework on 100 Bullets. And then he has a lot of short, dark works. Lex Luthor: Man of Steel, Banner, Batman: City of Crime and Superman: for Tomorrow (the last two I'd consider REAL disappointments).
And then there's this...
I'd consider this an unofficial sequal to Grant Morrison's Seven Soldiers of Victory maxiseries, as well as the two major DC Crises. If you don't have knowledge of those and aren't a fan of third and fourth string DC heroes, villains and gobbeldygook getting their time to shine in the spotlight, then this series isn't going to do much for you.
However, if you do like this sort of stuff, this book has it in spades; it's weird and it's great and it's grand. Also, if you crave more Seven Unknown Men of Slaughter Swamp/The DC Architects weirdness, give this book a flip.
I definitely came into this book with little to no expectation, just hoping the story would be as good as the art (by the way, Chiang, the artist, is BRILLIANT). And I was blown away.
But, don't take my word for it!