In the 21st-century NFL, offense is king.
While 4,000 passing yards used to be the exception, that's now considered an average year. A young quarterback threw for 50 touchdowns and 5,000-plus yards this past season, and he wasn't the first to accomplish that feat.
Therein lies the difficulty of trying to rank the greatest offenses in NFL history.
By almost any objective measure, the vast majority of the league's best offenses are from the last 20 years or so. That's reflected in these rankings—half of the top 10 is comprised of teams from the past decade.