tedster - 10:07 pm on Jun 2, 2011 (gmt 0)
See tedsters theory of low value pages affecting high value pages that are linked. Unless Mr Tedster has changed this idea ...
It still looks to me as though pages that link directly TO the most demoted pages show the second most severe demotions. However, to complicate the analysis a bit, Google sometimes notices a high quality page here and there and gives it a boost - even though other pages on that same site are demoted.
Would it make sense then to block the google spider (or logged out users) from viewing anything that might potentially be low quality?
It all depends on what you think low quality actually is. With no one pulling out of a Panda nose-dive so far, I wouldn't buy into any particular theories about what Google is using for Panda criteria, outside of the most obvious - stub pages, copied or spun content, pages that overlap in a major way with other pages.
Googlebot should not be able to access anything that requires a login anyway, right?
So it boils down to this: what kind of pages are you currently publishing that you think are low quality? If you think you've got such low quality content on the site, then why publish it at all?