Ben Stiller was extremely convincing. His portrayal of man who is distracted by his addiction at all times is excellent.
Unfortunately, that's the only redeeming thing about this film (aside from the chance to stare at Elizabeth Hurley, of course.)
I read in an above commentary that the viewer is never shown that Jerry is brilliant. I couldn't agree more. I want to think of him as a tortured genius, but it's tough to do when I'm given no reason to believe that he's anything more than a lowlife junkhead.
One thing I was impressed with was the scene in which Jerry and Redfoot (whatever his name is in this thing) are bouncing off of the windows, several stories above the street. Impressive filmwork, good use of Prodigy, etc.
Disappointing, to say the least.