10. Kordell Stewart
Stewart had two notorious postseason performances that defined him as a quarterback. The Pittsburgh Steeler had the talent but not the mentality to be a true franchise QB. The Steelers lost two AFC Championship games with Stewart as their starting play-caller. Firstly, in 1997 he threw away the game to the Denver Broncos in a cruel 24-21 defeat. But he was young there was sympathy for him.
But 2001 was a different story. The Steelers had the best defense in the league and a shiny new home stadium. All they needed was for Stewart, the team’s MVP and Pro Bowler, to perform to his level. New England lost Tom Brady to injury and brought on Drew Bledsoe. Meanwhile, the Patriots had a porous defense but it didn’t matter because Stewart missed passes and threw two pick-sixes in a miserable loss.