Strangely enough, I cannot. The Dark Knight is a great film, and one reason why is that it transcends the superhero genre and emerges as a morality play. Even Iron Man, the next best superhero of the year, and touted as one of the greatest superhero flicks of all-time, is not the sort of movie you would ever expect to see contending for best picture.
Dark Knight had story, acting (a truly outstanding cast, including Ledger, Eckhart, Oldman, Freeman, Caine and Richie Coster), the usual effects, director... It was all there, and it was deep as well as fun. I mean, its always fun to see humanity at its darkest and weakest state.