I'm curious as to whether there are films that you, as a roleplayer, enjoy...in terms of the mood.
For instance, there's something amazing about the mood in 2001: A Space Odyssey (okay; there's a lot that's amazing about that film). I think that if an RPG could capture that feel, it would be incredibly enjoyable.
From a fantasy POV, I really enjoy the lighthearted interspersed with serious adventure. For that reason, the Conan films, especially Conan the Destroyer, is a fave of mine.
Although I really enjoy the mood of Johnny Mnemonic, I think the film overall is pretty unimpressive.