Forum Moderators: Robert Charlton & goodroi
Matt Cutts: Search Results Look Worse Without Links As Ranking Factor
So we don't have a version like that that is exposed to the public but we have our own experiments like that internally and the quality looks much much worse. It turns out backlinks, even though there is some noise and certainly a lot of spam, for the most part are still a really really big win in terms of quality of search results.
We played around with the idea of turning off backlink relevance and at least for now backlinks relevance still really helps in terms of making sure that we turn the best, most relevant, most topical set of search results.
[edited by: aakk9999 at 11:51 pm (utc) on Feb 19, 2014]