ok so ive been thinking about this for a long time and never seen anyone discuss it but that definitely doesnt mean it hasnt been discussed before. so when you first open the game application, especially first thing in the morning, i notice about 9 times out of 10 the area with a villager walking around also has some kind of weed or other blemish on it. is it possible that the intro screen shown when you first enter the game is trying to give you hints about "problem areas" in your town that are keeping your rating down? not really looking for a solid answer here just speculation.