Master Yi is NOT Over Powered!
It just so happens that Master Yi goes legendary and ends up with 30 kills every fucking game. But only because all Yi players are pro all-stars. It has nothing to do with Yi being OP. It just so happens, every team fight, the Yi shows up and gets a Penta kill. You try to focus him and he just uses Q to avoid all CC or big nukes. But it has nothing to do with Yi being OP because he is not, he just happens to face roll every game, but he's fine.