Not to offend anyone, but I'll give my outsider's view. Here are the things I've noticed:
1. Conditioning, strength, and raw physical toughness need improvement.
2. Tackling and bad angles are a constant problem.
3. Players make mistakes, but when they make the same ones over & over, they aren't being taught and corrected.
4. Everybody does it sometimes, but ND is consistently playing up or down to their opponent's level instead of playing to their own level.
5. Defensive schemes and offensive play calling is too predictable, vanilla, and simple.
6. Too few players showing improvement, mastering the fundamentals, knowing their assignments correctly, being properly motivated, or being in top condition.
All of this indicates to me a problem with coaching. I think Kelly is a good to very good coach with the potential to be a very good to elite HC, but 99% of the problems I've seen and read you guys complaining about seem to fall on the position coaches and coordinators just not doing a particularly good job.
ND has talent and the ND brand makes recruiting top talent relatively easy, but the assistants have to develop those players, do a better job of teaching them, correcting their mistakes, and get more out of them than they've been doing. It may be time for Kelly to do a major overhaul of his staff.