A few of the games that I think would make great movies are listed below;
Halo/Halo 2/Halo 3
Mass Effect (imagine if Stanly Kubrick was still alive, and he made a movie of this)
Max Payne (the movie they did stunk, but imagine what it would be like if David Fincher were too do it)
Gears of War (could be Legend Directors Cut meets fellowship of the Ring meets Saving Private Ryan... done right of course)
Ocarina of Time (now this one could be up there with Legend directors Cut for how epic and transporting it would be... if it was done right)
Half-Life & Half-Life 2 (imagine if Christopher Nolan directed these, I think he'd make them great)
Turok; Dinosaur Hunter (if only Ridley Scott could stay old school for this one, then you'd know it would be in the right hands)
Deus ex (another one I'd like too see David Fincher tackle, if not him then Rian Johnson)
Those are only a few of the games that I think could make great films.
What are some of the games that YOU think could make great films, and what director do you think would serve them the best justice?