Yasuo's Wind Wall is broken and lacks counter play.

There is just not enough options available to work around such a super strong, and ridiculous ability. Imagine a team fight, and this is where the main problem is.

Bait it out - This requires the Yasuo to make a mistake, and has nothing to do with anyone but the person playing Yasuo messing up. This is not a viable counter play option.

Walk around Wind Wall - Team fights last mere seconds, and you expect an entire team not to cast spells/attack while moving around Wind Wall while the enemy team gets to freely cast/attack? Auto-loss.

Hold onto spells - Once again team fights last mere seconds, and your team is supposed to wait out a 3+ second Wind Wall while the enemy team gets to instant dump all their powerful spells? Auto-loss.

Only viable option - Have your team throw out a couple non-ultimate powerful spells in order to have Yasuo cast his Wind Wall, and then your entire team needs to run away/disengage, and then re-engage after the CDs have come back up from your team and before Wind Wall is up. Wow..... that is a lot of required team work just to not auto-lose to a Yasuo's W ability.

Until Wind Wall is changed, Yasuo will continue to hold one of Leagues highest ban/pick rates because that one ability can too easily win team fights even if Yasuo fed all game.