The force, not the movie.
I was hoping this would be the first sci-fi movie to get the gravity right on Mars.
I have no idea how they could have accomplished this from a SFX perspective and maybe it wouldn't have added to the story. I was disappointed with the scene where he was disassembling the MAV and the pieces were falling to the surface at a very Earth-like speed. Seemed like a easy place to add a little SFX magic to mimic Mars gravity.
Great movie overall though!