Bidvertiser stands alone in that it is the only Adsense alternative that never made me angry.
It’s the only ad network that I experimented with that didn’t make me want to turn on adblock on my own site, which had pretty minimal ads in the first place.
Earnings were terrible, as shown below. My site was a general-purpose non-niche site with global traffic based mostly in India, Pakistan, Turkey, and other non-high-revenue countries for advertising. In addition, the traffic volume was not high enough to attract anyone seeking to buy ads specifically on the site. Given that, take these earnings with a grain (or a bowl) of salt. Earnings would be much higher if your traffic was entirely from the U.S. Even so, the same traffic with Adsense would likely have earned around $8 or so.
If I had another site to monetize that was not compatible with Adsense, I’d use them again. I just wouldn’t expect to buy a fancy yacht from the earnings.