Answers go live every other Thursday at pm PT. Ask Riot gets a lot of questions about how we decide on your teammates and opponents in League, and we wanted to take some of the frequently asked ones and give them to the designers that work on matchmaking, champion select, position select, and all that good stuff. In terms of design, we want League to be a game where getting a small advantage and running with it is one path to victory. Any small successes that are snowballed can determine early leads, and then sometimes the result of the game. Being wrecked is much more visceral than the joy of dominating your opponent, and the really bad moments can unfortunately be more memorable than the great ones.
Why is Riot's matchmaking so bad? : leagueoflegends
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Your Matchmaking Rating MMR is a number that Riot uses to determine your skill, and when matchmaking, the skill of your opponents. It goes up when you win, and goes down when you lose. When looking for games to put you in, it will look for other players whose numbers are close to yours. You have a separate MMR in each queue, so you can climb in one queue without it affecting others.