6. 1991 Redskins (won Super Bowl XXVI)
The Redskins were so dominant in their 14-2 campaign that they lost their two games by a combined 5 points. Led by coach Joe Gibbs, the Redskins offense starred quarterback Mark Rypien and two 1,000-yard receivers, Gary Clark and Art Monk.
They outscored their opponents in the regular season by 261 points. Once they made it into the playoffs they defeated their opponents by an average of greater than 20 points. The Bills had no chance, as they were defeated 37-24.