I rarely found American comedy movies funny. There are rare exceptions. Meet the Parents was quite funny. Mrs. Doubtfire was great also. It depends on the actor who is the lead role. That will most certainly make or break the comedic aspect. I'm probably in the minority here, but I never laughed during an Adam Sandler movie. I find the guy unfunny, however, a guy like, say, Jim Carrey, who has a similar "obnoxious and in-your-face" style of comedy, is funny in some movies, such as, Liar Liar.