I am not so sure of that...
As others have said, a quick-tempo offense that sputters often will make it vastly more difficult for the defense to remain stout. Time of possession is a key factor in this issue. In 6 games this year, OSU has averaged 29 minutes, 2 seconds per game.
Going further than that, break down the TOP:
When Ohio State is leading in Time of Possession, opponents have scored an average of 14 points per game.
When Ohio State is losing in Time of Possession, opponents have scored an average of 27 points per game.
I am sure the defense is under-achieving and sub-par for OSU, no doubt. However, if the offense is sputtering and having a lot of quick 3-and-outs, that will cause problems for the defense. As others made mention of the Nebraska game - we held them far better when our offense was effective, than when we were going no where on offense.
So as Meyer's offense improves (and it has, obviously), the defense should also see some improvements, outside of simply learning to tackle and the like.