What about Dominion? Or Impact(spaaaaaaaaaaaaaaaaaaaaaaaace!)? Or even your signiture? What about storyline things, like the Didact? I know Halo 4 may not play as well, but thats only the outdated 360s fault.
Dominion = New Idea for Domination = Meh
Impact... I'd rather have an awesome forge canvas than space.
Campaign = Ive never really liked Master Chief's Halo Story... he's too... invincible. Its boring.