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It seems that these certified ad networks are currently available to publishers in few selected countries
Keep in mind many of these ad networks such as TradeDoubler do not have CPC ads but have CPA kind of affiliate code where you need an action like a sale, a lead etc
There are people who claim they have seen a rise in earnings from these networks with an ad format of 300x250 which is a standard ad size for new media ads and I kind of believe that
Another issue that third party ad networks help resolve is filling your ad inventory for regions which do not have adwords ads such as ads from certain regions due to the unsupported languages in adsense
All in all, its like Google doing a hostile take over of all ad networks and bringing it under one umbrella
"Trust me" from ASA does not seem to be working, and I understand why.
Only when they SHOW US the data, will there be acceptance!
Speculation arises - the data is not good. This becomes the inevitable presumption. Many will leap to the conclusion that they are no good, when reported recent overall poor performance is due to entirely different reasons. A "Guilty" verdict, caused by no data.