For me, I'm not a fan of the current feedback system since there is a reason why, for example, Facebook, Twitter, etc., don't have a dislike button.
Just because 99% of the humanity can't be trusted to rationally assess other people's behavior, that doesn't mean that nobody can. People who use Facebook & co. are very ignorant and sheep to begin with.
Answer to OP: More than necessary, restraint is more often exercised than not.