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.
Green Lantern. I think too many people had the expectation of that Green Lantern powers would be something more serious. They were always cartoonish, and Hal Jordan was always a bit of a dick. Ryan Reynolds was probably not the best choice, he's a bit too pretty for the role, but he had the right attitude. Still overall a fun movie.