First, two of the games you watched had OSU playing a completely different gameplan. Second, when you are winning a game by 30 points, you generally going to run the ball every play no matter what. I don't think number of plays running vs. passing is really a logical comaprison.
ND OSU NW Texas Tech
Passing YPG: 334.3 215.1 296.8 403.6
Rushing YPG: 154.8 189.5 195.9 107.4
Passing Y% 68.4% 53.2% 60.2% 79.0%
Rushing Y% 31.6% 46.8% 39.8% 21.0%
So I was wrong. ND is EVEN MORE one dimensional than NW on offense. Not as bad as Texas Tech, however.
To close, a funny picture:
