well, having never seen the movie I can't say for sure. But in a world that gives 4 stars to anything above average, in all the reviews I saw leading up to it's release in the UK, pretty much all of them gave it two stars. Jonathan Ross on Film 2002 (who IS my bible) said the film was dumb.
My sister saw it a few weeks ago, and after the film I asked her what she would give it out of 10 - she said she couldn't give it 1 because she DID laugh at it, so she gave it a 2! She gave it a 2, but insisted that it was NOT a good film. I havent been tempted to see it.