Call this a QQ thread or whatever you feel like, but at the moment I feel Yasuo is way too strong.
With the current iterations of crit items and his passive, he can get 100% crit with two items, and can then happily build whatever tank stats he wants and not suffer too much of penalty in his damage output. And even then it's not all that necessary, seeing how Phantom Dancer works now.
I'm thinking maybe lower the bonus crit to 50% would be a good way to go about it. That way, two crit items would give him 75%, giving a small amount of leyway to not have the crap beaten out of you.