In that article you linked, it had this link for statistical analysis of playoff performance by QBs (excludes this weekend's SB). Jake Delhomme ranked higher than Joe Flacco. Surprised to see Favre at #5, I thought he would appear later in the list.
http://www.footballperspective.com/the-best-playoff-quarterbacks-in-the-super-bowl-era/
But it's hard to argue against Flacco if I just get one choice for the Super Bowl and the Super Bowl is the only game I need him for