Nearly every Yasuo I see is useless

Cz Yasuo can either be:

• a feeding brat who constantly 1v5's people despite him being way behind.
• an obnoxious laner to go against as he tries to EEEEEEQEEEEQEEEEEQ like some kind of weebo-ninja.

You ban him so you don't get one on your team

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My Yas sucks. Their Yas rocks.

i hate playing against him, super overloaded and it tilts me when i'm playing such a simple mage

The answer lies in what you just said my friend.