Overall, I thought the movie was good. The base storyline was in no way original or particularly interesting. But the actual filming made up for that. However, I never even considered buying the game.
Even with it being the largest grossing film of all time (to date), I find it a bit surprising 2.5 million copies of the game sold. I'm guessing the margin on this game was very good. I'll bet they didn't spend a lot to make it.