I am SO glad I got the chance to see Dark Knight on IMAX, and miraculously, before I knew anything about the plot twists.
I've heard Leger is likely to get a posthumous Oscar nomination for this, and after seeing his performance, he should without question win one.
I loved everything about this film, it was gritty, dark, and visually amazing. The cast is perfect, and Michael Caine just always makes me smile. I was riveted through the entire thing, and I'd see it again right now.
If you haven't seen it, DO IT NOW. Best movie I've seen in a long time.