Master Yi ult needs to be nerfed

Master Yi's ult is one of the most broke ults there is. He can't be slowed, it gives him a huge attack and movement speed buff, but the most unfair and OP part of his ability is that it resets his cool downs when he gets a kill or assist. He already does massive damage so why does he need an let this powerful? If he has a decent amount of attack and 90 crib chance and armor penetration all of his hits do 800+ damage with fast attack speed and movement speed that you can't outrun and incredibly rarely survive. No mater how much of a tank you are you will almost never beat or escape him in a one vs. one or even in team fights. In team fights he is still super OP because with his Q he can deal massive damage instantly to all close enemy champs that he lunges to. Please Riot i know for a fact that so many of your players can agree that Master Yi's let needs to be nerfed.