A lot of games have plots that are silly and might not translate well into film... but one would think that a racing game would be hard to screw up. It's about racing, you just need enough plot to justify street racing. Ask our hero why he's in illegal street racing and he says, "I got bills to pay, I got mouths to feed, ain't nuttin' in this world for free. Now gimme your wallet."
Though to be honest, of all the racing games I have no idea why anyone would say "We have to do Need for Speed!" Yes, I know it's EA looking for cruel and unusual ways to milk their franchises, but I really can't think of anything about Need for Speed that makes it stand out. A Ridge Racer movie would have a hot chick doing their best Reiko Nagase cosplay, and that would be something to look forward to XD
I forget that one game, but it was the one with the traps and explosions, and dropping planes on foes. That would be pretty crazy to have onscreen as a pure popcorn flick.
Driver... just make Driver: San Fransisco a movie already! I suck at racing games, but it was good fun.