Ok even though I'm going to get like 30 downvotes, let me explain why he's just so frustrating to lane against.
His passive, yea yea just auto attack it to get it down. But what if you're a melee champ? Let him get a free Q on you while you auto attack it? Lategame you aren't going to have a chance to auto attack it because if you're AA range is too short even if you're a ranged champion then he'll just dash onto you and burst you down. This passive also lets him get in the middle of a teamfight easier like malzahar does, but at least malzahar just ults to lock someone down. Yasuo can keep going from enemy to enemy doing autoattacks that deal 600+ damage.
His Windwall, he can just play extremely safe when it's down. Trying to ult one of the enemy carries as
? Nope. Yasuo just comes in and windwalls. I know you're supposed to combo him when it's down or whatever, but this skill just has so much utility and it's extremely frustrating to play against if your team isn't a 5 man premade that is gold+ and is using a mic. Tbh, this skill seems like a second ultimate but on a lower cooldown.
Wanna focus him down first? Then what do you do about the
or
or whatever the other high priority champs are? He's just gonna block all your stuff with his windwall anyway. Should the whole team just ignore everyone but Yasuo?
And 50 percent armor penetration..He's basically a melee adc but with more health and burst with high DPS to go along with it. It's easier to just ban him.