How match making works.
Match making ive noticed so far is where the game allows you to win some, lose some. how you can tell whether or not your going to win is obviously who your matched with in comp wise.
2nd you can easily tell is by the loading screen into the game, how many mastery points they have vs how many you got. if their above 100k, their mains and your most likely going to lose this game.
then theirs games where its flipped around. you get the good team, and the mains are now suddenly on your team. its annoying. but ive seen it many times now and can predict if im winning or going to lose this game. sigh. boring.