Matchmaking System

Last game I played, all of my team was around level 20, but we had a Yi on our team that fed. I checked his profile after game. 7 wins at level 21. Their team had 2 level 20~, 1 level 8, and two Gold ranked with 1k+ normal wins. The two golds on their team carried. 18/7/12 and 11/7/12. Our Yi ended 1/12/3.