Football Outsiders does opponent adjusted defensive rankings.
Instead of thinking of it as "if you take out those three touchdown plays, we're right in the game", try thinking about it as, can you still be an excellent defensive team if your schedule included two of the top 15 offenses in your first 7 games?
Here are the defensive F+ ranks for the teams Ohio State has played, and sack adjusted yards per carry and yards per pass that Ohio State gained.
||Def F+ rank
||OSU yards per pass
Ohio State has played a lot of bad defenses, one good defense (Maryland 32), and the best defense in the country (Virginia Tech 1). Virginia Tech is an all round great defense, where Penn State is excellent against the run game and pedestrian against the pass. This game is going to be an excellent test of Ohio State's offense, and will shape the narrative as to whether the Virginia Tech game was an inexperienced quarterback and offensive line struggling against a turn back the clock defensive concept that they didn't see coming (46 defense, 85 Bears rule!), or was just the fact that Ohio State can't score against good defenses.
Personally, I'm putting my hopes into the Tom Herman and Ed Warinner are two great offensive minds who have had the time to foster growth in the young quarterback and offensive line since week 2 narrative. But, that's just like my opinion man.