Stars have nothing to do with "most people use".
The closest metric to that is either downloads or trends (both of which you can sort by)
Downloads IMO aren't a real good metric depending upon how the maintainers handle the container. It is a count of every pull of a container. So, if you have some container, installed it on January 1st, 2018 if it is updated automatically every week and you pull the update every week, then by the end of the year your one install actually counts as 52 downloads.
Trends are percentage increase of downloads from one month to another. It's an attempt to give a more accurate reflection of how many people are actually doing new installs.
Stars are kinda valid, but in order to give a "star" to a container you have to sign up for dockerHub, and then give it a star, which most people do not do. And even there it's all kinda BS. Just look at my own posts here and see what gets "Liked" or not. (Or look at Facebook for that matter)
Will an actual "rating" system come to CA in the future? Who knows.