The bad rating is given by banned players who disagree with their ban in one way or another.
As a GM my opiniong about this rating is going to be heavily biased, of course.
But I do want to say that I highly encourage anyone to not believe these reviews outright. With the way our rules work, the vast majority of them are blatant lies.
Everybody is free to set their ban history to public. But you will notice that most rants are made from players that hide their punishment history. Ask yourself why they would keep it private if they are telling the truth.