Yasuo op

Playing at quite low MMR I suppose, with my friend, almost every game there is a Yasuo who dominates. All it takes is a couple kills and a good Yasuo will ruin all the fun of the game. I tried to help top after Yasuo had 3 kills, and he can 2v1 easily. So I think he is op. and I write here because I'm frustrated; every time I want a friend to get into a game, they get too frustrated to continue because of such champions (also Zed, Yi etc but I don't think these are generally op just snowball vs noobs)
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