The Problem with Yasuo
Please don't downvote until you read the entire post, because I'm going to pull up some math stats to show why 
needs to be changed; mainly his crit damage %.
Right now, Yasuo deals 190% critical damage instead of the regular 200%. Now, this isn't a big deal due to the fact 10% reduction isn't a big number in terms of damage in the 100's. And making this his "balanced reduction" to compensate for Double critical chance from items is simply absurd...
But why do you say that? How is it absurd? He deals 10% less damage from crits!
Well, after doing some math and pairing against the champion with the highest base AD in the game (
) you can see that Yasuo has almost 0 punishment to compensate the amount of damage he deals to him. Let's build these guys alike until one of them reaches 100% crit chance. Now, I don't have the math at 100% because I didn't include armor reduction, abilities, or attack speed. This is simply a fisticuffs where both champions have 0 armor and 1.0 attack speed.
Base damage at 18: 109.776
Base damage at 18: 146
Item: 
Damage: 109.776
Crit: 40%
Damage: 146
Crit: 20%
Item: 
Damage: 189.776
Crit: 80%
Damage: 226
Crit: 40%
STOP: now deals 240% crit damage, and now deals 250% crit damage
Item: 
Damage: 209.776
Crit: 100%
Damage: 246
Crit: 55%
STOP: Items will now focus more on damage. 100% critical chance reached on
Item: 
Damage: 289.776
Crit: 100%
Damage: 326
Crit: 55%
Item: 
Damage: 329.776
Crit: 100%
Damage: 366
Crit: 55%
Battle: Champions will now auto attack at the same time, until one champion dies. will crit once every 2 hits, every 1 hit.
Damage the champion hits for will display on the left and HP will display on the right beside each champion for the hit 
will separate the numbers
Hit 1: 791.4624 1545.76 366 974.5376
Hit 2: 791.4624 630.76 915 183.0752
Hit 3: 791.4624 264.76 366 -608.3872
So why did you show this? What's the point?
Well, the point is that can get to 100% crit chance with just 3 items (2 with runes), while increasing his damage to 240% critical damage in just 3 items. This allows Yasuo to spend the last 3 item slots (4 with runes) for going pure damage or attack speed and gain the potential to out-damage any champion in the game on fair grounds. Not only that, but with crit-damage runes and damage masteries, becomes the strongest champion in the game. He can counter-play ranged champions without punishment, gains a shield that doesn't need to be activated before getting hit, and has more mobility than most champions with his dash.
doesn't take a hit in damage that other champions have to in order to double their damage permanently with critical chance. Most champions need to build 4-5 items to get to 100% ciritical chance, taking a big hit on their damage potential. again, does not.
What I believe should happen to make it more fair, and to give some character punishment, is to reduce his critical chance even more, to about 150-170% critical damage. This creates a situation where damage spikes higher than other champions with items, but takes a hit on his critical damage because of his lack of items he needs to reach 100% ( or even 80-90%).
Also give wind wall a resource requirement....there's no punishment for using the ability other than a 16 second cooldown. That's enough to have it up before a 2nd fight or gank
