Northern Team + Weak Division =>
Artificially Good Regular Season Record =>
Home Field Advantage in the Playoffs =>
Northern Team hosting Southern Team for the Conference Championship in Bitter Cold =>
Overrated Northern Team going to a Warm Weather Super Bowl =>
Top Four Teams in the Other Conference Competing for the Right To Beat Northern Team in the Super Bowl
As evidence, consider the Minnesota Vikings (0-4, defeated by four different AFL/AFC teams from 1969-1976) and the Buffalo Bills (0-4, defeated by three different NFC teams from 1990-1993).