Halo has so many things that still make it Halo. Want a bunch named?
No Iron sights
Infection, oh, CoD took that too? Yeah, we had it first.
NO NOOB TUBE!
No killstreak rewards that kill off 30 players. Only weapons or powerups. Go figure.
Awesome balance. Not ruined by loadouts. Go figure. Proof? Tallgeese played it, I played it, and many others played it.
And many more. Think, Activision and Treyarch employees were hired to help make this. Their habits were rubbed off in a way. But not the same way. Dude, play it, obtain unhappiness if at all possible, THEN come back denouncing it.