Why does everyone hate Yasuo?

I used to main {{champion:157}} but I moved on to other champions. As soon as I quit playing him for a while I realized how much this champion was hated. And why? Some people say "fcking noob champ 1 sec q cd" or " noob broken champ ". I've never really understood why he is so hated. So can someone with experience tell me why he is so hated?
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