Instead of making a game a movie, I would like if a game was used as the concept for a movie.
For example, the Dragon Age and Mass Effect mythos and universe that has been built would be a fantastic scenario for a film - as long as it was it was it's own stand alone creation.
Then there's inFamous, with the superhero thing being very fashionable at the moment.
Assassin's Creed universe could be very good - and I would almost want to see the inevitable Desmond chapter as a film as opposed to a game, alleviating a problematic gameplay persepective (how does one be an assassin in a world where infra red, motion sensors, alarms and projectile weapons are more commonplace than the cutlery) - especially considering the quality of the Assassin's Creed II prelude, Lineage.
If Square Enix hired an established director (and stayed on a separate continent to avoid interference) - they could do wonders with some of their source material, Final Fantasy VIII is a perfect candidate to be fleshed with the issues of time travel, Guardian Force head messery and a very potent love triangle. Christopher Nolan would love something like that.
That was longer than expected.