Ang Lee's Hulk was actually a well made movie with a decent script and nice acting. The problem (if you think there was one) was that it aped Bruce Jones' run on Hulk at the time which was all about "less is more". When you can build that sort of suspense for months to a payoff, it works well. However many (most?) people have expectations of a Hulk movie.. #1 being Hulk Smash and #1 being Smash A LOT Hulk DOES.
Ang Lee made an outstanding comic book movie centered around the mythology of The Hulk. But people mostly wanted a modern CGI version of the 70s TV show. Neither is right or wrong.. but when you went in hoping for the latter, you were probably pretty pissed when it turned out to be the former.