OK, if you're one of those easily offended people who can't enjoy anything, then I suggest a different movie. You go watch some Meg Ryan romantic comedy, and we'll be over here enjoying ourselves if anyone needs us.
This film was pretty funny, if a bit caught up in the mockumentary craze of a couple years ago. Most of the performances were dead on, from the teenage girl crazed pharmacist to Kirstie Alley's "devout Lutheran" mother with her own demons. I particularly enjoyed Mo Gaffney and Nora Dunn (perhaps better known for being on Absolutely Fabulous and SNL, respectively); I wished they'd had more on screen time.
For a film that attempted to parody so much: the Midwest, beauty pageants, well-off Christians, middle American small towns, white trash, overachieving teenagers, and all around general BS-ers... I'd say it succeeded.
The script was spectacular... the movie is drenched with irony that many people (i.e. Americans) are bound to misunderstand. I understand that if farting or kicks to the nuts aren't involved, it isn't funny, but try to understand situational-verbal humor. You might get it.
Cinematically, this movie isn't spectacular, but it isn't meant to be. While this isn't the best movie I've ever seen, nor is it in the top 20, it is one of the movies I've most enjoyed watching.