It may not be the best Batman movie, but it's definitely the longest. I've never been grateful for an intermission in an English movie before, but during the Dark Knight I decided it was much needed. Our party was running out of food and water, and we'd instituted rationing. But Shailaja was beginning to eye my leg hungrily. And that was before Heath Ledger started doing that thing with his lips (a tick that emerges after the Joker's capture).
Seriously, I think the only reviewer I've read who nailed this one was Newsweek's David Ansen, who called the film a "sometimes oppressive" epic, and lamented, "You may emerge more exhausted than elated. Nolan wants to prove that a superhero movie needn't be disposable, effects-ridden junk food, and you have to admire his ambition. But this is Batman, not Hamlet." Call me shallow, but I wish it were a little more fun."
By the way: Hamlet was too long, as well.