Yes, I think our pass defense has been poor but it has not been as bad as the national rank of dead last by a 100 plus yards per game certainly.
One of the big problems for our defense has been our offense - the feast or famine effect one might call it. Our offense - no matter the 50/50 approximate ratio of passes to runs has very low time of possession. Drives are typically 3 and out or we move down the field quickly with 15 yard chunks. Even our TD drives which are only about 3 or 4 per game or so last less than 3 minutes. Often our possession may last barely 1 minute. We snap the ball with 10 or 12 seconds remaining on the play clock even after a run. We are running a sort of hurry up offense. Of course we have far too many incomplete passes and our completions tends to be for first downs. When we have the ball, between the lack of ordinary running plays within the boundaries, the incomplete passes, pass completions with receivers going out of bounds, etc, we stop the clock most of the time. As a result, we use very little game clock when we have the ball. This loads up on the defense. Our opponents are getting more possessions per game and more time to run plays against us. This gives them more yards per game statistically.