@ReVamp: In case of Batman, I agree somewhat. I think the story's lost a bit of steam since I suspect that the whole Court of Owls thing wasn't supposed to be a crossover at first. So they had to wait until every other book had their characters in place. Or somewhere close to somewhere where they could show up in Batman's book. But it's not really bad and got us maybe - if you combine all the filler-parts - one issue of filler.
Green Lantern. This is a weird one. I read the Johns Reboot. I loved it. Then came Blackest Night and I somehow just had enough of the whole ringslinging. I tried to get back into it a couple of times, but every time I couldn't bring myself to get excited about the next issue. And thus, I stopped reading it.
As for I, Vampire. That's just terrible. Plain and simple. Also, a comic does not suddenly become grimdark when you fail to draw eyes.