My friend and I are in our 20's and only went to see this movie for the New Moon trailer. There were only about a dozen other girls in the theater, half of who left after screaming their heads off through the entire trailer.
The movie itself was better then I expected. Granted, its not targeted to my age group but the movie tried to throw in big name bands that there is no way these kids would know who they were.
I thought this movie was hysterical. For those of you who thought it was a waste of time: What did you expect? Sasha Baron Cohen basically makes the same movies with different characters.
The rating even includes "vulgar nudity" so you should have seen that coming.
If gross out and shocking humor isn't your thing then don't go see it. This movie definitely isn't for everyone.