I use the rating system like this:
If it arrives to my door with no problems, the product description matches what the product is like and the service from the seller is good it's a 10/10
I think there needs to be a revision of how the rating system works as when the product is mediocre and it's advertised as mediocre it seems a bit shitty to trash the sellers rating by putting a lower score when they've told you it's bang average.
Just my view on it anyway.
If it's advertised as premium Gods cum and you get it and it's peasants arse biscuits that's when I'd leave a below 10 review as they have been dishonest.