I don't trust Rotten Tomatoes since they made me see 2 of the worst movies ever made: Spartan (it's down to 64% fresh now but it used to be %85) and Team America: World Police (78% fresh).
Twilight has been lacking in the freshness catagory until the UK critics stepped in! The reviews from UK are 95% fresh! Way to go Rob and Twilight! At least your country men get it/us.