With films getting bigger and bigger it is only natural for companies to want to cash in on the video game version of a film. Future films are already have games in development like Thor, and Captain America. One would think that these video games could live up to magic that the film produces. The problem is that movie video games have not had a great track record. Failures in movie video games goes all the way back to E.T. for the Atari which is one of video games biggest flops. Even today the reviews for more current film video games like Tron Legacy, Iron Man 2, Super Man Returns, and Clash of The Titans are not as flattering as the movie themselves.
Those are brilliant movie-based video games, but yeah, generally they suck, cept for a few gems.