I computed a huge list of 500 top PDFs from Hacker News in 2018 if you're interested:
Over 500 Top PDFs posted to Hacker News in 2018:
https://getpolarized.io/2019/01/08/top-pdfs-of-2018-hackerne...
Over 500 Top PDFs posted to Hacker News in 2018:
https://getpolarized.io/2019/01/08/top-pdfs-of-2018-hackerne...
A large number of comments doesn't necessarily imply higher quality; it could just be a bunch of tangential discussions were spawned.
Do you have that as a .bib file for these by any chance? Maybe there is a way to auto-generate one using google scholar bibtex citations...