maxmoritz - 5:52 pm on Feb 28, 2011 (gmt 0)
I do not see this as having anything to do with writing quality, although of course I could be wrong. The sites that dropped in my niche all had the same quality/level of writing as the sites that remained. It may be a combination of things, but it's definitely not as simple as some judge of writing quality.
It looks to me like something was added to the algo that devalued sites rather than a changed the ranking order. None of the SERPs I look at changed with sites moving up and down and all around. Sites got devalued. Other sites moved up as a result of them moving down. Does anyone else have this view?