According to Techcrunch, Apple's play for the mobile advertising market isn't hitting as hard as it needs to. "The general consensus among the advertising community is that [iAd] is a product they don't want." [Techcrunch]
I remember hearing dozens of Fanbois on this very site saying that iAds was the end for Google and that Apple was slowly going to take over the WebAd space. I remember thinking it was a laughable notion at the time. Making good hardware and a nice platform is all engineering and one or two people who understand what consumers want. Apple had absolutely zero corporate skill sets that would allow it to succeed in this arena.