Some of the replies here make me cringe so much... I expect that if all these players complaining formed a premade of their own they'd still get stomped. I have almost never heard good players complain about premades. Wzs are just two groups of players matched against each other, and there will almost always be a difference in the skill level between the two groups. That's what decides whether there will be a win or a loss. Not necessarily the presence of a premade.