No stars:
Five stars:
It is extremely obvious that these are different when directly compared, but when visiting addon pages with no reference, it is very hard to tell if you are seeing a five-star addon or viewing an unrated addon.
By hovering the rating, one can see the rating details, but at a glance it isn’t clear (at least to me).
May I suggest that the stars use an accent color (rather than a monochrome scale). In this way, any grey color would indicate no ratings while any non-monochrome color (regardless of theme changes) would indicate the star rating average.
Please consider,
Mark Vincent