The reason Video Game movies fail is because it doesn't live with the image gamers had. If you played Half-Life 2, then watched a movie on it, there's a big difference between playing and watching.
Here's some VG movies I saw and was repulsed:
Wing commander: Made for SNES platform, later PC. In this movie there's little to do with the game story. There was a freaking gun fight for christ sakes, in the game it was either fly your ship or chill on the Tigerclaw. I was disgusted.
Mario Brothers: Bad, the fact that it delt with evolution and Bowser looked retarded. The movie shames the Mario Legacy.
Mortal Kombat: Would've been good if they didn't one side the fights. The series could've been left off but they had to sequel it into a non game spin off.
Street Fighter: Saw first 10 minutes and literally ejected the tape into the trash can. Story rape.