IMO the problem with Yasuo isn't the inherent "brokenness" of any individual part of his kit...
But rather a good Yasuo is probably one of the most complicated things to just to punish. Dedicated Yasuo mains abuse the complexity of playing against him to the point where it often feels like the laning phase is decided on his terms. Playing against Yasuo for a lot of champions requires almost as much expertise on Yasuo as playing AS him. THIS is why a lot of mid/lower level players despise him. It actually even gives him an advantage because demanding so much attention to fight him makes him either a massive distraction or a champion that thrives massively off distractions. It drains so much of a opponent's mental budget just to play against him, and a player can only pay attention to so many different things.
As frustrating as champions like Fizz, Malzahar, and Zed can be, they are a lot more straightforward to actually lane against and fight. Meanwhile you could write a goddamn book on playing against Yasuo. He ultimately becomes some fucked up inverse Lee Sin or Azir.
, and
, you don't pay much attention to the dozens of mediocre ones you face, but get whooped by the good ones and gg this champion is bullshit.
etc. nuke you for your entire health bar and then some in an instant, it stings less somehow because they don't highlight your weaknesses as clearly.
, and how you feel about them now.
, or
to survive the upfront burst at lower health
into him and enjoy my auto win lane.