I doubt there is any single metric that is
a predictor of quality but I think citations is probably a good proxy. Of
course, there are probably counter-examples but generally an article with lots
of citations suggests a sincere effort at a better-quality article.
We are currently having the opposite experience in the education field. The problem is tertiary level students who have learn that references are important, but not that the nature of the thing referenced is important. So when a lecturer sets a class assignment of writing a Wikipedia article they include their list of 50 primary sources that they've been building up in zotero, with little to no consideration of their appropriateness.
Then they wonder why the article gets PRODd.
Cheers
Stuart