Black Panther has a rating of 96% at Rotten Tomatoes. So whatever the scale is, nothing is really meaningful. I've been in the cinema with about 60 other people and a friend. statistically one of us should have enjoyed it but we both found the movie shit. So no, 10 stars is not more meaningful as 5 stars. 2-4 should be enough to still be wrong about taste once in a while.