indyank - 5:15 pm on Jul 24, 2012 (gmt 0)
There are definitely several aspects to quality. These crawl errors were definitely part of technical quality along with broken links, site speed etc. There are several evidences to believe that Google does give this a certain weight in its quality evaluation as they did unearth and report several of these crawl errors for Panda victims (as early as the first release) and surprisingly several of them were for pages that were removed from the site, years ago. This, not only confirms the "Google never forgets pages and their urls" theory but also the fact that they did run a complete quality evaluation including technical quality, using whatever (unforgotten) data they had with them.