I played a match yesterday in Gold. I had an Irelia mid, who I SHIT YOU NOT, has won one single ranked game. Ever. She had 20% winrate. TWENTY FUCKING PERCENT/1 game.
She walked up to her tower and stood under it, and afk a bit. Yas starts hitting her, finally she comes back as I ask "Irelia are you awake?" She then goes berserk over this and ints the entire game. The real int, with no champ damage, not the struggle one.
There is zero reason that player should be in anything other than iron league, and there is no way matchmaking can work when players with thousands of games on their account get matched with that. But Riot find make sure it keeps happening.