The final act is the only thing salvageable
Pretty much everything in this film falls flat until the final act, wherein Paul Giamatti shows up and miraculously saves it from being a complete bomb. His showdown with Pattinson in the last thirty minutes were engaging enough that I didn't feel I got totally ripped off.
http://www.youtube.com/watch?feature=player_embedded&v=w18TwPMhCsE