Despite its popularity, game to film adaptations have alwasy been a risky venture for studios. Recently we saw successful conversions such as tomb raider and resident evil( both of which were OK ), but the number of sleepers over the years have far surpassed the number of box office hits. I personally don' t encourage these conversions, unless it' s done faithfully and well. Here are a couple of films that ' might' work.

DRIVER
DEUS EX
ALONE IN THE DARK
ALICE
FATAL FRAME
THE GETAWAY
GTA
HITMAN
MAX PAYNE
MECH WARRIOR
NIGHTMARE CREATURES
METROID
RETURN TO CASTLE WOLFENSTEIN
SpyHunter
Halo

Of course, those are the few games that have movie quality in them, meaning they have a good story, premise, etc, but there are a few that should be left alone. And here they are:

Crazy Taxi
Dead or Alive
Duke Nukem
Soul Calibur
Tekken
PacMan ( WTF? )

These are just rumours though some of them are already in production.