Wow, I don't think I saw the same movie as everyone else here. For some reason I can't put my finger on some major flaw that pushed me away from this movie. I'll try to explain.
First, (most people might disagree with this) I think that the action was unevenly dispersed. There were about 3 main fights throughout the whole movie. Even though they were action packed, I couldn't help but feel somewhat defeated after the fight was over. I expected some gigantic climactic fiery battle between Joker and Batman when batman was driving the motorcycle straight toward joker. Instead batman just falls, and then the other guy ended up capturing him.
Also, Batman has always been a prowling creature in the shadows, and that's what's cool about him. It gives criminals a reason to fear him. But now he just seems kind of like a government figure. Especially when he's talking about city crimes on a rooftop with commissioner Gordon. There's also the thing about his voice. Batman's voice is completely different than Bruce Wayne's. I know it's to hide his identity, but it starts sounding somewhat absurd when he talks for long periods of time.
The length of the movie made it drag on a bit, but that's not much of a serious issue. I loved the directing in the movie, and how the joker keeps you on the edge of your seat, but overall the movie felt somewhat unbalanced.