RB vs WR

I was having a debate with a friend about which position is more important in a teams sucess. I said WR is more important, because you look at a team like Atlanta and how they can run on anybody but, there receivers can't get open. Which leads to Mike Vick playing poorly, which leads to alot of 8 in the box. Thats just my arguement, I'd like to hear from what you guys think.