I have literally never looked at github stars as a measure of quality or had it affect my decision. I have looked at git logs, websites, issues, etc. But I would be genuinely worried if someone used github stars as an indication. So many honestly stupid projects have a lot of stars, and stellar ones have next to none.
https://github.com/EvanLi/Github-Ranking/blob/master/Top100/...
proof here. The top are taken by chinese educational repos. Elastic Search and Spring Boot are the only projects actually used by anyone in the top 10. But why would I trust the stars for spring boot over the fact its used in every java shop on the planet?