More granular. Not more accurate. There is no independently measurable quantity being assessed.
What the hell difference does it make if something averages 3.2 on a scale of 5 compared to 4.5 on a scale of 7?
It's not about the average. It's about a more accurate rating system. As I said before, rating something 7 of 10 is more accurate then rating something 4 of 5.