We don't have this problem on well moderated servers, or even self-moderated servers (vote kick etc). Smaller better supported communities can self manage the cheating problem but only if they are given the tools to do so. Yeah cheaters can still sneak in, but only until they are kicked and banned.
Matchmaking for many games just gaurantees cheaters both in bottom tier play (cheaters on new accounts) and high tier play (cheaters not yet detected). There's no relief for the casual gamer, who plays well but not often enough to warrant moderated league/ranked games.