Has anyone seen Peter Jackson's Bad Taste?
It's one of his earliest, low-budget movies. After seeing that, you might be surprised that someone handed Peter Jackson The Lord Of The Rings franchise. Though he likely did a lot of stuff in between. Bad Taste is a film that is just...ugh, you've gotta see it.
That said, I think Peter Jackson is just producing, not directing. He'll probably have some say and throw money at it to make sure it works out some way but not directly...directing. Like Spielberg with the Transformers movie. So if Peter Jackson likes the game himself, he'll come up with something that kind of resembles it.
Having only played the first Halo, and the PC version of it, I found the game lackluster and overly hyped so on the basis of game experience alone I do not have excitement for the movie.
As for the Metroid movie, it's in limbo. I have nothing against John Woo and think he might be capable of doing more than stuff with twin pistols and doves everywhere, etc. but if the movie isn't progressing for other reasons, then it doesn't matter who's attached.
It WOULD be neat if the movie versions of these did go head to head. Then I'd definitely see the Metroid movie if only to try to increase its box-office take, but the Halo film will probably still do better because of all the hype it would probably have. Casual gamers are more likely to flock to Halo than Metroid.