If Pittsburgh wins, experts will say that Pittsburgh's road to the SB was easy (a #4 and #6) since they didn't have to face Tennessee and Manning the SuperHero.
I think if they play a good game, and win fairly soundly, they'll be cool with it. There are six seeds, and then there are 6 seeds. I don't think anyone considers the Ravens a pushover. If we win really ugly, or on a questionable play, they'll be all over either Arizona or Philly.
I don't even want to think about the talking heads contemplating a 6 seed vs. 6 seed Super Bowl (in additon to the obvious reason).