There may be spoilers on this thread, so if you haven't seen it yet, don't read any further.
First, I enjoyed the movie. I think that the reboot of Batman was the best thing that could have been done to the franchise. I love the fact that the last two films are dark, and that the Batman literally skates the thin line between justice and criminality. This is one of the reasons why I liked Batman over ll the other DC superheroes (that combined with the fact that Batman had no superpowers).
However, I am puzzled as to why this movie is doing so well. There was nothing in the movie that struck me as original. Even Heth Ledger's performance as Joker was not as showstopping as some other movie villians (though it was the best acting performance I have seen so far this year). Maybe this is proof that I am getting jaded in my old age? I don't know.
One of the other reasons that I did not like the movie that much was the unresolved manner in which the film left the Joker. I seem to recall that this was due to Ledger's untimely death, but I could be wrong.
Maybe some of you that saw this movie, can help me make sense of this, then again maybe not. However as it stands now, I do not think The Dark Knight was all it was cracked up to be.