I have a thing for the hero. Yummy. Dark, brooding Batman standing all alone on the corner of the roof of a skyscraper, blanketed in night. Yummy.
-- other than that:
... Heath Ledger was great.
... one of these days someone is going to leap off a building after someone else, thinking they can overtake and catch them. They're gonna discover they are misinformed about gravity.
... also ... you have to suspend pretty much all the laws of physics ... AND ... then all the tricks with the fast cars ROCK.