Nerf Yasuo
So we all know that Yasuo is a rather strong champion. I just played a game where he got first blood, then went down to 2.9 (or something), at the end of the game he was 14.11, and ultimately carried the game. Laning against him is always hard, until you figure out what you can do against him. I played as Ahri, which according to championselect.net is his smallest counter. Our team had excellent team comp, collectively we were pushing towers, getting kills, all that great stuff. As soon as Yasuo gets a kill, it's practically game over because the spike just comes right in.
Laning phase for Yasuo, I suggest that his Flow (shield), that he gains by movement be removed. In lane it is too much; I think that it's a fair compromise to remove this and therefore his gameplay can include a little more risk. At level 18 he blocks a total of 510 damage, that is absolutely ridiculous for such a mobile champion. His wind wall should be his only source of protection; having two shields with no mana consumption is unfair.
This incredibly offensive champion works insanely well in teamfights, with any source of knockups/dispositions, or a perfectly aimed whirlwind. His ultimate gives him maximum stacks of Flow and ignores 50% of the affected enemy's armour; that is the complete turn of the tide, regardless of the timing of his ultimate, whether it be to initiate a fight/gank or in the middle of an intense teamfight.
Is this your goal with this champion, Riot? I think that his set should be harshly reconsidered. At minimum his flow being removed would balance him better in any game.