TheMadScientist - 11:11 pm on Mar 2, 2011 (gmt 0)

Emphasis Mine ... Source linked in the preceding post.

Sites that believe they have been adversely impacted by the change should be sure to extensively evaluate their site quality. In particular, it’s important to note that low quality pages on one part of a site can impact the overall ranking of that site.

That's saying something right there.