there is one game I wish they would translate to the screen but more as a quality TV show than movie because there's so much content that one movie coulnd't do it justice.
The Legacy of Kain series. it has an awesome plot and amazing voice work.
Obviously KotOR cause you can't get enought Star Wars.
The Suikoden series is good candidate too, fairly well enchored inr eality aside from the runes and a good slew of characters.
I'd love a good Metroid movie but only if they kept the solo ambiance which can be hard for a movie.