Unfortunately it appears I'm going to have to get Batman Begins and watch it again to answer this question. There was no part of the movie which I didn't like. OK, the plot was entirely predictable but this is not a movie you see for plot twists. It had a lot of humour, things went boom and the special effects were well done. Also the casting of Robert Downey Jr. was (as has been mentioned many other places) brilliant.
To those of you who didn't come see it today (you know who you are): Shame on you. To the public at large, go see it now. It's worth getting fired for. (That is, it's worth you getting fired. Me not so much).