I've mentioned before in other threads that there's two sites I've worked on, both in creating them and for SEO. Both are small sites that haven't been touched in years.
One has thin content, as thin as the thinnest pages on my Pandalized site. The other has crummy content, and is an MFA site that I gave up on, probably before I'd ever heard the term "MFA".
Both are doing quite well in the SERPS. The MFA site has actually moved up in rank.