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2 – are so dismayed they immediately hit their back button, suddenly popping back onto our radar, alerting us to the fact they were displeased with the result we just showed them – why else would they suddenly come back, without consuming your content? Displeased.
No it's definitely site wide, but perhaps sub-domains might be effected differently.
Does anyone else agree with this or am I unique? I doubt it.
However the section on ads doesn't seem to line up with the rest of the points.
Google engineers have mentioned "ads dominating a layout" so frequently that I cannot doubt this is in play.
there are a large number of signals
I am sure if I saw your site I could find something that could be deemed Panda relevant, otherwise you wouldn't have suffered.