If you are a "build a great running game and defense" person, you need to read this.
"Compared to passing with its nice tight relationship, running's relationship with wins is weak. There may not be a relationship at all, except that there is a conspicuous absence of many teams with very strong running games and very low wins.
[...]this suggests that a good running game can save a bad team from notching only 3 or 4 wins, but it's not going to lead a team to the playoffs. Notice how few of the very best running teams exceed 8 wins, while the best passing teams win at least 8 games."