HOW MMR WORKS IN LEAGUE OF LEGENDS: GUIDE
MMR is one of the most significant game statistics while playing League of Legends. While it has no bearing on gameplay, this statistic serves as the basis for matching in the game. It decides who you will be competing against, far more so than any visual cue you may get in-game. Only Riot truly has complete insight to what is happening with your MMR. Nonetheless, there are a few methods for you to check your MMR if you're curious.