Are you referring to domains from Ben's redirect list?
On the topic:
Google certainly should have a team that goes after those "other" networks. Actually I can't say they already don;t have it, but people keep seeing various problems and therefore that makes me think Google should be more rigorous when about partners, being that search or content.
Long ago I disabled search partners in some of my campaigns when I discovered what was all that went under that attribute.
In some other campaigns, I check the conversion from time to time, and as long as I don't lose, I let it go.
I believe that irregularities that affect conversion on partners' side are greatly affected by the industry.
For example, if you're in software industry, especially security like anti virus, good luck with any kind of partners.
Content is even worse.
This is again a call for better transparency that we've been putting into places like this forum since long ago.
More transparency about search partners - show it like you show for content.
Even more transparency on the content side. I found domains that show no content, and yet they were able to squeeze over 10K from me in just one month.
I asked for investigation and the response was that all was OK. My comment about how I could not see any of the pages that were referred by Google's placement reports (I would get 404 for each) was commented back on by something like "many sites are running dynamic pages that change URLs over the time".
Total BS that made me kill that campaign by tremendously reducing my activity and going from 1-2K/day to $200/day with much better conversion.
Plus I'm very reluctant to go back and turn everything on (with big losers being excluded), and I say that it's Google's fault that I'm not confident enough.