Broadway - 12:49 pm on Feb 7, 2011 (gmt 0)
I would think that the type of MFAs that I personally find so offensive would have:
A high bounce rate.
More Adsense showing above the fold than text.
Duplicate / scraped content.
No links from authority sites.
Just approaching a clean up using some type of mix of these factors would produce a big improvement in the SERPs. DemandMedia pages might arguably have some merit but gosh, can't Google even get rid of the sites that 99% of us would agree have no value?