According to SI.com the 1992 Cowboys were the 10th best offense in the NFL over the last 25 years.
Of all the teams on this list, Dallas had the best balance between offense and defense. But don't underestimate the Cowboys' offense. NFL rushing king Emmitt Smith ran for 1,713 yards and 18 touchdowns and Troy Aikman threw 23 touchdowns in '92. Dallas outgained its opponents by over 100 yards a game and seemingly scored whenever it really needed to. The Cowboys also averaged 38.7 points per game in the playoffs en route to a Super Bowl championship.
I guess those 52 points against the Buffalo Bills in the Super Bowl helped that playoff point average. Here are the results of their post-season run.
NFC Divisional Playoff: won 34 - 10 vs. Philadelphia Eagles
NFC Championship Game: won 30 - 20 at San Francisco 49ers
Super Bowl: won 52 - 17 at Buffalo Bills