What is all the fuss about?
You beat me to it, and I've seen it.
My first advice would be to ignore all the hype, all the five star reviews.
Then, you might enjoy it more.
Before I go on I'll say that I thought Batman Begins was very good and I'm a big fan of Christopher Nolan's work.
I'm also a fan of his ridiculously good cast (Bale, Caine, Freeman, Oldman etc.).
But the simple fact of the matter is that The Dark Knight is not that good.
Whilst it has a very long running time it tries to cram in too many plots and too many characters, with not enough character or plot development.
My initial opinion of watching it left me thinking of a hyperactive 24.
Why is it getting so many positive reviews?
In my opinion, it's down to one man.
Heath Ledger.
Now Ledger is very good in it. But his performance is not enough to paper over the plot holes, the confusingly choreographed fight scenes and the fact that this film tries to do too many things without focussing on doing them well.
In my opinion, the glut of exceptional reviews is down to the fact that he put in a great performance and very sadly died.
A review that pretty much sums up my feelings appears here...
http://www.newyorker.com/arts/critics/cinema/2008/07/21/080721crci_cinema_denby