You could also make a convincing case that Mandarich wasn't there worst high first round pick in the 1980s. At least Mandarich had the skills, even without being roided up, to be a serviceable NFL player.
You could tell that Rich Campbell wasn't an NFL QB the first training camp. And they drafted him at the last minute over the guy all scouts wanted, Ronnie Lott.
Starr overruling the whole scouting staff to make that pick in 1981 was his worst mistake as the head guy.