i think they should try to encourage using perks other than ghost / sleight of hand / marathon
like combine lightweight and flak jacket to make a perk where you move quickly AND, while sprinting, you take less explosive damage. or ninja combined with immune to tactical effects like flashes or nova gas. something along those lines. cause right now, too many people just run ghost, and then a couple run hardline and that's it. some do scavenger, but those are really only the dorks that lob grenades all day (chucking grenades across the map and hoping you hit something.. epic facepalm)
either way, treyarch failed at class diversity