Points allowed per game. The Baltimore Ravens defense in 2000-2001 holds the NFL record for fewest points allowed in a season and is seen as the greatest defense in NFL history for that very reason, as well as said defense having to carry the team for much of the season as the Ravens offense went nearly 4 complete games without scoring a touchdown. Despite this the Ravens overwhelmed and beat down all of their opponents and absolutely destroyed an overhyped and vastly overrated New York Giants team in Super Bowl XXXV.