Yasuo is the most overrated champ in existence
His late game isn't even that good. His crits don't do max damage. Also, you can dodge his entire kit, with the exception of his dash (which btw can ONLY be used if an enemy is near him). Meanwhile assassins can 100-0 people at level 1, have instant repositioning abilities, stealth and can jump/leap/whatever over walls. Also, with most assassins, you can't dodge any of their damage. They just point and click on you, and you die. At least with Yasuo there is room for some counterplay. Also, assassins don't have sh*t base hp, unlike Yasuo. And the shield doesn't really do much for him, since all it takes is a few auto attacks to pop it.