For sure a good read, but there are few things you need to take in considation.
How do you judge an adnetwork?
If you buy traffic from adnetwork X then there also many parameters which you influence yourself which affects the performance. If you run a banner campaign, it highly depends on the banner you use. Also the placements of the banner is very import, frequency cap, etc. there are many things you need to take in consideration in order to judge.
Many websmasters also hop from adnetwork to another. so if one big source works this month with adnetwork X and next with adnetwork Y, then this affects performance.
Personally I like indicators like, self service, post or prepayment, Reply from the AM, dashboard/interface, targeting etc. I think that's a good way to judge a network on.
I can make this remark, a lot longer, but I think I made my point
Just saying.. ;-)
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