Inspired by the linked XKCD. Using 60% instead of 50% because that's an easy filter to apply on rottentomatoes.
I'll go first: I think "Sherlock Holmes: A game of Shadows" was awesome, from the plot to the characters ,and especially how they used screen-play to highlight how Sherlocks head works in these absurd ways.
A 60% on RT says that 6 out of 10 professional reviewers enjoyed this movie. It's not a rating of the movie itself. But my answer is Freddy Got Fingered.