MMR is the reason why your opponents always seem to be stronger than you. The matchmaking rating (MMR) is a number used by Riot Games to indicate a players skill level in League of Legends.

What is a good MMR in League of Legends?

WHAT IS LOW, HIGH AND NORMAL MMR IN LoL. You can determine if your MMR low, high or usual for your current league by looking at your LP gain/lose. If your LP gain is equal to 17-22 then you MMR is normal for your league and you will play against players whose league is close to yours.