Yasuo's kit and why it's unfun to play against.
Why is Yasuo unfun to play against? He's unfun for the same reasons old Ryze was. Yasuo's kit is always on. Level 1, Yasuo with E can dash six times in ten seconds. He gets a 100 damage shield for any ability his opponent has at level 1 to trade against him. Yasuo wins the trade, almost always, against a mage.
Level 2. Yasuo gets his Q. Now he has a kit that's always ready to dash six times, shield himself automatically, and aoe waveclear while doing so. This applies tremendous pressure on his opponent if Yasuo chooses to do so. His opponent's answer? If his opponent is a squishy low mobility caster, nothing. There's almost nothing his opponent can do to answer without losing the trade.
Level 3. Yasuo can outright block all his opponent's ranged attacks and abilities.
Levels 4-5. Yasuo doesn't get any weaker, you know.
Level 6. Now, if you get hit by his tornado, it's almost guaranteed death.
Levels 7+
Tons of burst dps knockupability with little to no counterplay.
Yasuo has no mana. Instead of having mana, he gets a free shield if he charges up his resource. He also only has double critical strike chance, nothing huge.
But really, you get the point. His kit is always on. It's always damaging. It scales harder than any other champion's kit with just a single item. He has all the cc, damage, mobility, assassination potential, dueling potential, and teamfight potential you could possibly want on a single champion.
He's super unfun to play against, and quite frankly, imbalanced.