Call of Duty 4 vs Halo 3.........Call of duty wins hands down. If you dissagree then you haven't played Call of Duty 4 yet. If you have played it and still disagree, then you are extremely biased towards Halo. I don't own an xbox but I've played enough of both games to know which one is better, and it's Call of Duty 4, so stop whining Halo fanboys because it's better and you'll have to to deal with it.