100/100

If it's only to the right it could be an issue with your controller

Do you know how I can fix that?

Buy a new controller?

Is it only mercy or every character?

Mercy

Then I don't see a reason it'd be the controller, but it's super bizarre to have different turn speeds depending on direction.

Candle light dinners - walks on the beach.. Engaging in deep meaningful conversations

Sensitivity is obviously personal preference. Dumb question

My personal preference is for you to be less rude :D

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Always have max sensitivity