Well, that kicked about 14 different kinds of ass.
I've also seen another halo based live-action trailer. I'm not sure if it was a commercial for Halo Wars, or Peter Jackson's Halo project, but there was a pelican and weapons and soldiers.... it was very cool looking (not quite as cool as the above...). I'm sure it's easy to find on YouTube. I'll try and post a link here if I remember.
As for who would play Master Chief, if there was a movie, and if they have any sense at all, they would keep his face hidden behind his Spartan Mask, (except for flashbacks to his childhood, if any - like the Starry Night H3 trailer) and get Steve Downes to continue doing the voice. Then they could get any big size actor (or wrestler or whatever) to do the action. If the Arbiter made an appearance, I'd like to see Keith David continue to do the voice for him, if for no other reason than Keith David is a guaratee for a great movie.
Were it not for the Counsel of the Arbiter, we would have glassed your entire planet.
I liked Doom. (I mostly enjoyed it cause of the Rock to be honest. )
I've come to expect that inconsistency with Hollywood now and just enjoy the movie for entertainment's sake... I'm just thrilled they're making more video game/comics related movies now than sappy, revolting chick flicks.
Take what we can get, I guess.