It is tough to grade Monti because he is in a Teflon situation.
The argument against Monti is that he has created the worst roster in football. He has done this by letting young talent walk, not signing any young talent in FA, and prioritizing 2024 draft picks. Also, Hopkins situation which is letting a top 3 player of the roster walk for nothing. When you are the GM, your job is to improve the roster. No one can argue that Monti has done this or that the roster is better than last years.
The Teflon part comes with the belief that this is the plan. Not be competitive, not improve the roster, and prioritize 2024. Those that believe this argue Monti is doing a wonderful job of building a loser. No one can argue this point either. We definitely have the least talented roster in football.