driller41 - 8:15 am on May 1, 2012 (gmt 0)
I have the same problem with my affiliate sites, EMDs are not the single problem, it is the overall combination, EMDs, low brand presence, low quality backlinks and affiliate monitorization.
When you combine all these things you are screwed.
What sort of demotions have you seen - I had a range, some -10 type stuff, some knocked down 5 pages or more.
I am trying to decide if these sites are salvageable, I think the heavily demoted sites may be finished and no amount of massaging them will do them any good - they still rank on Yahoo so I will leave them alone for that reason alone and concentrate elsewhere.