It starts pretty straight forward then it goes to disjointed as the universe falls apart, time is all messed up so things are out of sequence and it also features a LOT of characters randomly popping up.
If you don't like the more disjointed works of Morrison don't even try (neither The Return of Bruce Wayne). It's a kind of book that you might not get the first time but the more you read the more it unfolds but you have to have the fondness for Morrison's work for it.