I absolutely loved this film! I think it's a quiet cult waiting to be found by those willing to seek it, and it offers many laughs provided by the hero portrayed as Mary Katherine Gallagher, and Will Ferrell's comedy genius only further profits this movie's quality.
It is a bit rude at points so I feel that the certificate 15 is well suited, but with permission I feel that ages 13 and up will appreciate the light humour.