jenygard You are free to use any criteria for stars you see fit, but I think giving only factory styles 5 stars is not the best approach.
Factory styles already can be clearly separated, giving them all 5 stars serves no purpose. I would give overall 5 stars to styles you think sound the best. Don't you have you favorite factory styles that you think are the best? I would give them 5 stars. Rating factory styles kind of doesn't even make much sense probably as they are factory, we know what to expect. It's custom styles where we need the evaluation.
Giving 5 stars to factory styles under "Fits songs" makes even less sense I think since factory styles are not made to fit a single specific song perfectly, they are made to be generic enough. Often the same factory style fits 10 songs, I would give 5 stars to those songs that it fits the best, and less stars for song that would be kind of a stretch to use with this style.
So overall rating is more relevant for custom styles, and Fits Song rating is more relevant for factory styles, if it makes sense.
But again feel free to use your own criteria if it makes more sense to you. At the end I think the exact rules you use shouldn't matter that much, everyone will have slightly different criteria in any case. Just as long as everyone gives higher ratings to better styles and lower ratings to worse styles it should work out on average.
Maybe we would be able to come with some better rating system in the process...