It's a common defect with games directly based off of movies. More frequently than not, they are a travesty. That's not to say there aren't good movie games, but they try to stay so close to the film that it takes away from enjoyment of the game. Here's some ideas that might make them better.

1) Make as nice graphics as possible. Not as easy as it sounds. A major problem with movie games is that not only do they suck, but the graphics are just as crappy. I'll admit, beautiful graphics in a game can just blow me away. There is a surprising amount of people who can let their opinion be influenced by graphical quality.

2) Try to stray from the film just a little. Look, if we're playing the game, chances are we saw the movie. So we don't need to play what we just watched. If games based off movies had a bit more independence (for instance different areas, events that happened before or after the movie, that kind of thing), there is a lot more room for enjoyment.

3) Get quality voice acting. I can't tell you how many games have been ruined by awful voice-overs. If, say, in Lord of the Rings Aragorn was voiced by a crappy voice actor, I would want as little to do with him as possible. I want voices to resemble the character, and if you don't do that, it puts a lot of us off.

A bit of a tangent here but it is somewhat related. Why are there never games based off of books? One problem with movie adaptations of books is that they have to cut out plot details to make sitting in a movie theater bearable. Video games, on the other hand, provide a good medium to express literary works visually and not have to worry about cutting content, since a good game has a story that is much, much longer than any movie.