First of all these ads are ridiculously intrusive and seem to be an hinderance to the reading experience. I was so surprised when I saw them, they are huge and in the way and just strange. I thought WordPress had promised the ads would have been discreet and neatly included and not in your face.
From what I have heard the pay isn’t even all that great, so I will test it out for a month and decide where to go from there.
If this is WordPress attempt to challenge Google AdSense they will surely lose.
*just my very brief impression of WordAds.