It's not surprising that the NAB has greeted Google's radio plans with skepticism, or perhaps confusion. The Google workup I saw gives advertisers the ability to buy spots via an algorithm, target inventory and audiences, and largely cut out media buying agencies. That's what Google does, right: Cut out the middle man. And so it's not surprising the folks on the traditional side would point out all the flaws in what Google's doing.
And, yet, a survey by Jack Myers (for whom I write) find that Goog knows better than any other Web site how to handle clients. So, apparently, they know how to be a middle man, too. (And the gobs of hiring they've been doing is apparently not for naught.)