graeme_p - 6:34 am on Sep 13, 2012 (gmt 0)
I am sure that there is a problem with add relevance.
I have always got ads in related niches that were not really relevant, but I could see why an automated system was not clever enough to differentiate between the same keyword different contexts.
I have recently been seeing lots of completely irrelevant ads. The have been dating an gambling ads: in no way relevant to the site, and they could not possibly be IBA (not logged in to Google, session cookies only, have not visited any site that could related to either).
Those were from a UK IP, and I am pretty sure there are ads available in the niche in the UK - but I would prefer no ad to something this irrelevant.