Chris Johnson alone may be the best rushing attack in the league; throw in a quarterback with serious running skills, and you have a dynamic backfield.
So what is their competition?
Miami has Ronnie Brown and Ricky Williams, but Brown is always hurt and Williams is getting old. Also in the AFC East are CJ Spiller, Fred Jackson, and Marshawn Lynch in Buffalo, and Shonn Greene and LaDainian Tomlinson in New York. The Bills have injury issues at running back as well, and Shonn Greene is unproven for the Jets.
Jamaal Charles and Thomas Jones in Kansas City may be the best. Jamaal Charles is Chris Johnson with a bad offensive line and Thomas Jones had 1,400 yards and 14 touchdowns last year.
In Baltimore, Ray Rice, Willis McGahee, and LeRon McClain make for a dynamic backfield. However, McClain is now become almost strictly a blocking fullback.
Dallas's supposed "three-headed monster" is a bit overrated. Still, Felix Jones, Marion Barber, and Tashard Choice are pretty darn good. Dallas is still a passing team, however.
Carolina gets my vote as the best rushing attack in the NFL. DeAngelo Williams had over 1,100 yards and seven touchdowns in 13 games last year. Meanwhile, Jonathan Stewart had over 1,000 yards and 10 touchdowns as well.
Stewart had over 150 yards in each of the final three games of the year when he was the sole starter, due to Williams's injury. Two years ago when Williams was the feature back, he racked up a huge 1,500 yards and 18 rushing touchdowns—20 total! If Carolina had any sort of a passing game at all to make teams not put all 11 guys up in the box, this tandem would break records, which they already are.
It's tough for the Titans to win this argument when you're talking about a quarterback as a main rusher, but there's no doubt that with Chris Johnson leading the way, the Titans running game should continue to wreck havoc on opposing defenses across the league.