It's almost 2018, and we're in preseason 8...
...So why, for the love of god, are we still unironically complaining about Yasuo?
Like, really. Sure, he's annoying. But so is Singed. Yet nobody says he's broken.
Teemo's also annoying. Yet, outside of URF, unless you're a Darius main, you don't say Teemo's broken.
Does Yasuo need some kind of rework? Yes. He does. He needs to be made a bit less annoying to fight, and able to be played in higher tiers without stomping low tier. Does this mean he's broken? No. You can need a rework without being broken one way or the other. Riot does have him more or less balanced, so that he's not abysmal at all tiers (sucks higher up, but is viable in the more casual tiers), without automatically stomping any rank.
Just because he was buffed to be given a decent MR (still behind most melee champions in mr/level, though) doesn't mean he's suddenly become god tier, 80% winrate bullshit. He just got a buff that just about everyone that's not a tank needs right now - an actually relevant MR.
So calm the hell down. You can still instantly win against him by picking any assassin at all. That's all you guys pick, anyways.