I played around with IMDB and Rotten Tomatoes scores for all films of 2011 to arrive, subjectively, at a reasonable formula for combining the two to make one list of the most highly-rated films of 2011: just multiply the unweighted IMDB score times the RT score. That allows newer / smaller films to enjoy the ratings IMDB users actually gave them while using RT to more heavily weight the field. The films that make up the top 20 don’t change much, though, whatever formula you use.

Here’s the result:

8.6   A Separation [Jodaeiye Nader az Simin] (2011)
8.148 The Artist (2011)
7.872 Harry Potter and the Deathly Hallows: Part 2 (2011)
7.857 The Muppets (2011)
7.802 Hugo (2011/II)
7.533 Drive (2011)
7.533 50/50 (2011)
7.505 Moneyball (2011)
7.254 Mission: Impossible - Ghost Protocol (2011)
7.254 Midnight in Paris (2011)
7.138 The Girl with the Dragon Tattoo (2011)
7.12  The Descendants (2011)
7.03  The Guard (2011)
7.007 Delhi Belly (2011)
6.992 Source Code (2011)
6.873 X-Men: First Class (2011)
6.862 Win Win (2011)
6.806 Warrior (2011)
6.552 We Need to Talk About Kevin (2011)
6.545 Tinker Tailor Soldier Spy (2011)