If you completely removed Yasuo's windwall...
... he would still be a viable pick.
Now add one of the most brokenly overpowered skills in the game to his unbelievably front-loaded kit and what do you have? a Lee-level OP mid laner/top laner.
BUT NO; What we really need to nerf is Rammus, Anivia and Skarner, they're overpowered as f***. Come on Riot.