I think his point was that he acted in good faith -- with the expectation that Google would reciprocate -- and was essentially let down without courtesy. Even a simple "sorry, we're unable to interview you, our apologies for asking you to get an extension" would have gone a long way, even if just for the word-of-mouth reputation.
On the one hand, I feel kind of stupid bitching about my experience with Google, even though it really did happen. I don't like bitching.
On the other hand, as we hackers talk about this kind of issue at Google, maybe they'll eventually listen and shape up a bit if there really are systemic problems, and that's a win for everyone.
I actually tried giving Google "suggestions," though I don't think it made an impact (which is to be expected and understandable).
I think Google does listen and try to improve in response to feedback. Interviews and hiring can be especially hard, because of the number of resumes, phone screens, and interviews involved. For what it's worth, I think the interview and screening process has gotten better over the years, even if we have a ways to go.
Why would you care? Essentially when you boil it down to eesentials (ie what pays for your paycheck) Google is an advertising company with a terrible track record on human rights and privacy.