Everyone disagreed on Halo 3 being another game where your the green guy shooting pigging noisy aliens.
Till now, most Halo addict was CoD addicts to. (Raises hand) and i have to say, CoD has my vote. I never bought Halo 3 because i never get a chance on my sisters 360 (even tho, i set it up for her) but it was mainly cos i was doing the same thing i started on Halo 1.
CoD tho was extremely fun when it firstly released and stuck to WWII battles for about another extra 6 games. (CoD1, UO, Big Red One, Road to Victory, CoD3, CoD2)
In one of their reviews with GameTrailers they was glad they left WWII behind and started on MW.