While it cannot be argued that the offense was certainly the weak link today, I am not sure the defense can be totally absolved of blame.
The 3rd down defense was terrible, 3rd and 7 or longer should rarely be converted, yet it is continually converted on the Gophers (Purdue did it a few times early last week too).
I am not convinced that PSU wouldn't have scored more on our defense if they felt any need to do so. It's kind of like the Vikings with TJack at QB. Offenses would be conservative against the Vikings because they didn't want to give them a turnover...they knew TJack couldn't beat them.