If ‘over-rated’ is defined by the status attached to a player v’s that players true capability (ie; can be a good player but incredibly over-hyped), the most overrated player ever, by a country mile in my opinion, was Cameron Smith. Commentators were constantly saying he was the best player in the world, never made mistakes, led the tackle count etc etc … whereas he was generally little better than average in general play, made plenty of errors and was always the third man in In defence.
A good footballer and good reader of the play for sure, but I called him Cameron Myth, because of the absurd sycophantic hoopla that always surrounded him.