Personally...I'd love to see this film once it's made...since the novels provide a fairly strong setting, the main character is a complete Badass, and...well, it's a sci-fi action-humans-against-monstrous(yet cool)-aliens-from-the-far-flung-edges-of-space kinda flick.
Did I mention I love the game? And that Bungie has made certain that they will have the final say on all things that go into their movie...which fills me with hope since I've got faith in that particular company, and an intense yearning for the summer of 2007 to just get here already.
BTW...Mortal Kombat was decent, in that it somewhat closely mirrored the game (But I couldn't help but laugh during most of the film), and Resident Evil was decent...since.........well, I never really watched that one, since I've no interest in the series.