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.
The Fountain is my favorite movie of all time, and it has a 52% critic score on RT. Audience Score is better-ish though at 77%, so maybe it's just the critics who didn't get it.