Since 1970 merger. Strike years not included (no 1982, 1987), Plus only selecting 1 team, and 1 year. Most teams won SB, a few made playoffs, and 1 (77 ATL) missed playoffs.
#1 simply because they had NO OFFENSE in 2000.They went 5 games without an offensive TD. They killed my Gmen in SB and faced top teams in playoffs. Greatest Defense EVER!! Sorry Bears fans see more on 2000 Baltimore Ravens season
1985 Chciago Bears
Team went 15-1 and trounced NE in SB. Often said to be greatest ever. My argument is this, they played in a very very weak division that year. Det, Min, GB and TB didn't have winning records. Plus those teams were at the bottom of offense in NFL. Played 2 teams with winning records (LA Rams and Mia-which beat them). Sorry Bears fans. Team was great, but not greatest.
1976 Pittsburgh Steelers
This team statistically was better than the 1978 squad. I think the whole defense should be in HOF. Name a weakness? Green, Lambert, Ham, Blount, Shell. Wow!!!
1972 Miami Dolphins
Team not only went undefeated, but their no-name defense stymied people. They gave up fewest total yards and points. Oh and did I mention they went 16-0!!!