You'll never know exactly how it is that the game measures skill, and you'll never be sure that the matchmaker is using that data effectively.
But I agree with you, and if it was up to me then skill would be judged on accuracy with automatics and nothing else. That would solve the problem. Until people figured out that was what was happening and then they'd start randomly shooting into the air to lower their mmr and get easier lobbies. Because people suck. If you didn't already know.
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