Don't know if it really goes unnoticed or people simply don't care.
Even without stats saying that a champion is too strong, if they have frustrating game mechanics, then people will complain. Especially champions with alot of mobility get complaints alot, since hitting an enemy which is constantly dashing around is not really fun and can make it difficult to stay out of their threatening zone.
Jinx doesn't have this. No mobility whatsoever (except for passive MS, which requires either objective taken or kill secured) and you know exactly her threat radius. If she walks towards you, you can simply back off.
Not saying that Jinx isn't too strong right now. But people simply don't seem to feel that she is unfair to play against, hence why her banrate is basically not existent.