Niantic will never give us that information. BUT I use “I don’t know” on at least one section - usually several - on almost every review that I don’t outright reject, and my rating is “Great.” In fact, a lot of people with lower ratings will find that their rating goes up when they start using “I don’t know” more.
Agreements were coming in fast as they made adjustments for a bug, so this may be why you don’t seem to be seeing them come as quickly now.