Yeah, some are crap, like the Avatar game, hated that one. But there are some nice ones too, like Mission Impossible and The Matrix (actually I loved that game).
I argee that most movies that turn into games are total fails for example Underworld-awesome movie horibble game you just run around in an area that can almost completly fill your screen and kill things!!!
Terminator Salvation was a decent game, great for boosting Gamerscore too. I also can't wait to play the new transformers game, if you've seen the trailer, you know what I mean.