There seems to me a lot of opinion here but little information.While it is true that BidVertiser may pay less then AdSense to some,they will pay more to others-and they have a much better support system.
They have at least 8 different pay levels for every ad,what the topic of your site is,what and where your traffic comes from,is it a free hosted site or a real website?
All these things and more come into play.
Again,there are many factors,but over all,if you have a PR of even 0 then BidVertiser will,if your traffic is acceptable will pay you very well.
They increase your epc as your time with them goes on.Or lower it.
I think instead of asking if they should be used instead of AdSense people should be using them with AdSense-as their ads are much wider category based and you will pick up some of the 40-60 % of the ad clicks done on non contextual ads-the spontaneous shopper traffic which AdSense totally ignores.
Also-they pay many more new publsihers then AdSense does,and while they do have a strict TOS,they do reply to support and they do listen to appeals and are much more user friendly then AdSense.
As for using them for Advertising I have a slightly better ROI with them then AdSense,but not as good as with 7Search.
Much more information then I share here on Bidvertiser can be easily found-but I hope this is helpful to some.