I can agree with these others on live action. If thats the case tho, the movie producers need to take out the actors voices and keep the originals from the games. I promise you all, live action or not if the movie producers don't keep the same voices through and through the movie they spent millions or more on won't mean crap. NO one wants to see this movie with actors voices, but from the one's that started it from the games!
If this movie does not have the character voices from the video; ex: Master Chief, and Cortana and the others, this movie is not going to be worth wasteing time or money on. So movie producers, get those voices from the video game, or your millions and billions will be worth nada in the end. And no one will want to see your movie.