PSU is an interesting case for us. This season, we've beaten teams with pretty bad defenses:
UNLV: 106th total defense
New Mexico State: 123rd total defense
San Jose State: 93rd total defense
Northwestern: 80th total defense
Nebraska: 70th total defense
Indiana: 117th total defense
And we've struggled against teams that have better defenses (regardless of their offense):
Iowa: 13th total defense
Michigan: 28th total defense
Coming into Saturday's game, Penn State falls closer toward the teams we've beaten in total defense at 57th, but is, by no small margin, ahead of all of them. And, by no small margin, firmly behind Iowa and Michigan.
On the offensive side of things, it hasn't really seemed to matter (we've beaten three top-30 offenses in Nebraska, SJSU and Indiana, but lost to Iowa and Michigan - both north of 60 in offensive ranking). Penn State is 49th in total offense.
That said, it would seem we will need our usual defensive effort, but an offensive effort slightly better than usual to give us a good win. It would be our best win, relative to the opponent's defensive strength, all season.
Just some food for thought, thought it was interesting.
(Side note: our last two games are against the #6 defense and #1 defense. Ouch)