Mussina is far from the first ball player to be one.
But, as far as douche bags go, even you have to admit, he didnt do things like spit in the umpire face, head butt his head into end zone wall after scoring a touchdown. His posse didnt shot somebody in Las Vegas coming out of a strip joint, nor did I ever see a report on TMZ where he was drunk and running naked through the hotel lobby.