I was just talking to a friend about this. The past 15 years the AFC has been so top heavy. 1 or 2 teams with a shot at winning the title and then a bunch of garbage.
Since Brady and Belichick got together, I think there have only been 6 different AFC teams to make it to the Super Bowl: the Pats , Steelers, Colts, Ravens, Raiders and Broncos. On the NFC side, there have been 12 in that time frame.