A bunch of Decent ideas with no real development.
We have a United Planets that seem to exist just to either come to Superman's rescue or vice-versa. No real development of the organization. I get working out trade deals and writing interplanetary law are boring, but that is what this type of organization would be there for, so why create it and put Superman in the center of it if those aren't the stories you want to tell?
Lots of time devoted to the undeveloped plot threads that are Leviathan.
OOHH- let's pull the Earth into the Phantom Zone just for spectacle. But it's just another Wednesday in the DCU and no one really notices.
What if Jon Kent was lost for half-a-decade and no one really noticed? Jon comes back and rather than spend time with his family (who he hasn't seen in years) instead runs off to join the Legion. Superman shrugs and Lois is too busy with some news article to even be bothered.
Bendis was all talk (pun fits perfectly) and no follow through. He built a bunch of shiny story engines that should be changing the DCU (Leviathan, UP) but no one else seems to have any idea what to do with them (and Bendis moves on to the next idea).