What in the fuck does a pick 6 have to do with Peyton Manning failing time and time again in the playoffs? Do you want me to go by his playoff games slowly one by one with you so you can see? The Colts averaged 27 ppg in those 6 seasons where Peyton failed in the playoffs yet averaged 11 ppg in those playoff defeats.
http://www.pro-football-reference.com/players/MannPe00.htm
look for yourself.
The Colts failed in the playoffs. Not Peyton Manning alone. They would have won those playoff losses 11-0 if the defense had prevented the other teams from scoring. Who in the heck looks at a game and says "oh the defense played well, they only allowed so many points, but the offense just didn't score enough to win? That's absurd reasoning, unless its a low scoring single digit game (like the one last Monday night). Either the Colts lost as a team, or the defense choked. The only way you can hang a loss on a QB is if that QB is directly responsible for it, i.e. by throwing a pick six.