Nebraska's defense is ranked 33 in total defense. Nebraska's offense is ranked 39 in total offense. Nebraska's offense is averaging 478 yards per game, which is good, but a healthy 100 yards behind Oregon's 578 yards per game. Louisville is leading the country averaging 754 yards per game!
In comparison, Oregon's defense is ranked 82nd. Their offense is ranked 8th.
Using VERY simple math, the average of the two (offense and defense) rankings, Nebraska is 36, while Oregon is 45. Granted, this is two games into the season and very much dependent on who the teams have played, but I'd take a blended average of offense and defense advantage here.
I don't care much for passing defense vs. rushing defense as I think if a team is really good at shutting down the run, it is logical that the pass defense will be ranked lower due to forcing teams to pass more.
I'd love to see both the offense and defense in the top 25 at some point this season. Top 25 certainly doesn't equal playoff consideration (that is where you likely need at least one of your units in the top 10), but it sure would be a nice lift from a year ago, where Nebraska's defense was 64th and its offense was 34th - a blended average of 50.