Now, that's a pretty low bar to crawl over, and no one should take this as some sort of real recommendation. I don't feel that I wasted my money or time, but I'm easily amused.
In discussing the movie, we agreed that it read like a D&D campaign crossed with a renfair, with a sense of humor that is just a bit more lowbrow than South Park. Indeed, if they'd targeted a few more of the jokes at the over-13 crowd, it would clearly have been more fun. On the plus side, Natalie Portman essentially wanders in from a completely different and much more earnest movie, and the interactions between her character (equally stereotyped, but much more serious) with the rest of the cast provides an incongruous note that is sometimes pretty funny.
Overall, though, there's no particular reason to see it aside from the fact that there's an overall dearth of decent-looking movies to provide a better alternative...