Those are the movies that came out in 2010 in France and that I saw in a movie theater. I couldn't include in my Top Favourites Cracks or Avatar because they were released in 2009 (at least in France). Also, movies like Black Swan cannot be in my Top because it only comes out in February here.
My Top 15
15. Tout ce qui brille | 2010 | Hervé Mimran, Géraldine Nakache
14. Les petits mouchoirs (Little White Lies) | 2010 | Guillaume Canet
13. L'Arnacoeur (Heartbreaker) | 2010 | Pascal Chaumeil
12. The Karate Kid | 2010 | Harald Zwart
11. Harry Potter and the Deathly Hallows, Part 1 | 2010 | David Yates
10. Tangled | 2010 | Nathan Greno, Byron Howard
09. Toy Story 3 | 2010 | Lee Unkrich
08. Kick-Ass | 2010 | Matthew Vaughn
07. How to Train Your Dragon | 2010 | Dean DeBlois, Chris Sanders
06. Kaboom | 2010 | Greg Araki
05. Shutter Island | 2010 | Martin Scorsese
04. Agora | 2009 | Alejandro Amenábar
02 ex-aequo. A Single Man | 2009 | Tom Ford
02 ex-aequo. The Social Network | 2010 | David Fincher
01. Inception | 2010 | Christopher Nolan
I kinda liked them or they trully sucked, but I saw them in a movie theater