8. 1975 Steelers (won Super Bowl X)
This was a true “Steel Curtain” Steelers team. Sure, it featured future Hall of Famers Terry Bradshaw and Lynn Swann, but they hadn’t really got it going on offense yet. This was a team lead by their defensive unit.
This “Steel Curtain” defense lead by “Mean” Joe Green and Jack Lambert, is considered one of the best defenses in history. Consider they went up against a Cowboys team thought of to be similar in quality and came out victorious, and you’ve got yourself a top ten team in NFL history.