First of all, Google went public in 2004. I would like you to point me to a study showing the steady decline in quality since that time. Who are these 'lots of businessmen' you talk about? One of the complaints about Google has actually been that they prefer to have engineers in all sorts of roles including management.
Now, since you've gone all conspiracy theorist, I have a theory of my own, I hope you will excuse it. My theory is that the pro-Apple blogging community has gone ape-shit over a perceived threat to iOS from Google, and are now looking at them as 'The enemy', and this whole rash of blog posts maligning Google is part of a larger 'Death by a thousand paper cuts' strategy to make Google seem uncool, and therefore, as we all concur, dead. I also believe that said bloggers are in fact undercover employees of Apple who get paid by the number of times they mention Apple products in reviews of their competitors' products, but that's just me being nuts.