Yasuo is pretty balanced.
Seriously, he might be super annoying with his E. He might kill your adc in teamfights really easily. He may block all of your abilities with his windwall. But you gotta remember that there is always countermeasures to champions like these. People Yasuo can't do well against include Jax, Darius, and Malzahar. As you can see, they all have some form of raw damage or cc. Jax can easily stun Yasuo. Darius simply does more damage in the early levels. Malzahar can suppress him and let the voidlings do the work. Of course, later on, he hits his power spike and gets a huge burst of damage, but then that comes down to who can protect their carries better in these teamfights. Use people like Janna or Thresh to do this. If that doesn't work let the brusiers jump on him too.
