You need to quickly disable the 'Stronghold' exotic armor in combination with the new weapon type, the lightsaber. Once a player acquires special ammunition in 3v3, they can continuously block and reflect bullets. It might not be very noticeable in Deathmatch mode, but in Domination mode, it's impossible to deal effective damage to their team (even when I use a weapon with special ammo, I can't counter them effectively) or capture the zones. When they block attacks and get close, a single hit instantly kills me.