Do we have the right assumptions and guiding principles for developing a QA and review policy?
It might be interesting to tie the quality measure/ratings to each article's history page rather than the article page itself... then it would be obvious what changes had taken place since which reviews.
I like the notion of having some measure of quality based on the number of "eyes" by measure of unique edits, who have contributed to an article page. You're right, from a technical perspective this is a measure of the history page rather than the article itself.
I've not looked at the Flagged Revisions extension in detail yet --- so not sure how this might relate to the history page itself.