Well there no rules (as far as I know) about the rating. For me it goes like this:
1-2 stars: Rules not followed
3-5 stars: Rules followed (the amount of definitives, CTOs and very normale stamps 1960-1990'ish) make the difference between the 3 levels)
If people expect stamps from the wishlist, 100stamps.club isen't the right place, it is randome swapping here, and the wishlist can only be a guidence. Of course if the wishlist is followed, it for me can change the rating positivly = a lot I would have rated 3 can get 4 if the sender have followed my wishlist.
When I have seen some of the pictures and the rating for it, I really dont understand the rating. But hopefully the receiver have explained the rating in the message. If I have given less than 5 I also write the resson for the rating