EditorialGuy - 8:13 pm on Oct 25, 2013 (gmt 0)
Wouldn't you need a fairly high degree of confidence in Googles ability to determine what is and is not spammy to use the appearance of rich snippets in the serps as a guide to site quality?
Plus, "moving toward" isn't the same as "having arrived."
Probably not a reliable signal of low quality for sites without rich snippets.
That's definitely true. Also, rich snippets are for pages, not for sites, and not all pages from a site show up in the SERPs with rich snippets all the time.
Still, goodroi's basic idea seems reasonable: If you see rich snippets for a page (especially six months or a year from now), the author probably isn't on Google's "spammers we hate" list.