Well, according to the poster it's 'outrageously funny'.
Here's a clip from a review by Andy Gibbons at MSN:
Directed by John ‘An American Werewolf In London’ Landis, B&H certainly comes with a great pedigree and, as befits it’s cast, is largely played for laughs – it’s just a shame the writers forgot to include many jokes. ...the cast, which includes more celebrity cameos that I could count, do the best they can with what they’ve got. But perhaps if Landis, Pegg and Serkis had been allowed to give the script a bit of a comedy polish, things would have worked out better. (2 out of 5 stars).
Trailer isn't inspiring, but, in a weird way, I think this movie is a near-miss.