Originally Posted by: macbob 
Thanks Macbob. Almost brought a tear to my eye.
1) OK, maybe top 50 would be better. And don't get me wrong. I don't hate RBs. My favorite non-Packer ever was Wallie Payton. My favorite non-Packer today is Adrian Peterson. This is just what the research has been telling me.
2) Well, only a real bad back is gonna get -2 yards a carry. Even a 3rd string RB should get you at least 2.5 ypc. Unless of course your OL sucks and in that case, your QB is probably dead anyways and you won't get that far, even with an elite D. You still need some offense.
But you really don't need success. There is no historical difference since the 80s (it takes forever to sift through stats so I don't go back very far) between having the #1 rushing team and the #20 rushing team. The stand out elite rushing team who was dominant were the 90s Cows and the 90s Broncos. But there have been so many really bad teams at running the ball who have won Championships that they statistically even out the 90s Broncos and Cows.
So once again, in importance is:
1) elite D,
2) elite QB
And that's pretty much it. Of course a real bad OL gets your QB killed so that's somewhere up there in importance.
EDIT: Just in case you were wondering (which I'm sure you were) how our recent SB winning teams were in rushing, here ya go:
1996 Packers - Out of 30 teams, 14th in attempts, 11 in yards, 19th in TDs
2010 Packers - Out of 32 teams, 20th in attempts, 24th in yards, 19th in TDs
To be honest, I was surprised we ran that well in 1996. I thought we'd be in the bottom 10. But then I forgot that we had a dual RB system that year.