I have not seen a 4 star karma yet...let alone 3, 2 or 1 star.
People don't want to give 1 star, 2 star. That's understandable. They just want to be nice. If they haven't liked the cuddle experience they don't give karma at all and just move on.
But honestly I would like to see at least a few 3 stars and 4 star karmas. "All 5 stars" kind of underutilize the potential of karmas.