UnrealQuakie: Ah dude mk 1 movie was a blast and I still have the cd soundtrack of it
CharlesGrey: Really was a good film, all things considered. And the soundtrack was pretty cool too, now that you mention it.
I could actually think of several fairly decent video game movies, although they usually tend to stray from the storyline and characters of the games they're based on, for better or worse. And things really go downhill once they start making sequels.
On topic: It's *beep*ing World of Warcraft, quite possibly the most well known and biggest game franchise in existence -- Of course the thing is a commercial success, regardless of its quality.