You can't really go wrong with Christian Bale and of Course Chris Nolan ( memento ) being involved just screams great movie.
I saw it yesterday and although the editing at the beginnning of the film was rather odd and slightly choppy it is by far the best comic book movie out there.
I saw the Machinist in the movie theater when it came out, along with American Psycho it firmly cements Bale as one of the best actors around.
Find it if you can