You don't need to crowdsource everything. I've never used stars as a good metric because it's literally zero effort. It's anybody who happens by just stars it, So all you can really conclude from star count is that this is interesting to this number of people.
Two metrics that I think correlate extremely highly with quality: The number of commits in the repository and the date of the most recent commit. I've used a metric based on those two inputs for the past 15 years to evaluate repos and I am not disappointed. Depending on the nature of the project, I weigh the two attributes differently. Some projects are arguably, 'done', and so the date of the most recent commit is not very important in that case.