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.
Yellowbeard (1983) sort of qualifies with 22% tomatometer but 64% audience score.
Critics (and John Cleese) didn't like the movie at all but my friends and I all love it! Hard to dislike a stupid comedy stuffed with an incredible array of comedians; Cheech and Chong, Most of the cast of Monty Python, Peter Boyle and Marty Feldman, Peter Cook, and many other well known comedians of the 1960s and 70s. We still quote lines from the movie!