How to fix Yasuo
Replace his Q with an AOE taunt that gives him bonus armour penetration, but makes him immobile for 2 seconds whilst giving enemies bonus attack speed and 50% bonus damage dealt against him.
Or just make him Jetsteam Sam https://67.media.tumblr.com/5300bb95428c1fb5f205d4037b006800/tumblr_mvywzsoHdE1sflgwko1_500.gif
/jk
He would 70% more likable as Sam.