In all honesty, it comes down to individual skill. Two days ago, a massive VAC wave happened and everyone found it easier to rank up - so the hackers were gone. I've played many a game with griefers, nothing much you can do about it unless you manage to outskill them by such a margin that you end up carrying them anyway. I've been smurfing on my mate's silver 4 account, in a week it hit nova master. I've won against some blatant wallers (with shit aim) and won with one or two griefers on my team. If you really don't want a fuckwit on your team, of course it's best to play with your mates, but sometimes I just solo q for an "easier" game.