User blog comment:Vectus13/Yasuo is Unreliable?/@comment-9463023-20131124100503/@comment-9463023-20131124203817

Each time the wall blocks a turret shot, an error message appears. And Riot's official statement is that it does not do that - PBE's role is exactly this, finding bugs and fixing them before they make it to the main client.

You just need to realise, your job is not to initiate, in teamfights you are there to clean up and damage your enemies, while your frontline draws their attention. With your Q on a 2 second cooldown (which is not hard to get it to), you can charge it up during the teamfight and then use the ultimate when the time is right. Also, remember that not only Yasuo's knockup allows him to use the ultimate, he has great synergy with the likes of Cho'gath, Janna, Xin and others :D

And the best use of the wall ever is blocking Miss Fortune's whole ultimate :D