Personally, I don't see what all the fuss is about. So they changed their logo, big deal! It is still a very recognizable Microsoft image.
When IE9 came out, it had a new logo, and nobody even bothered to comment on it as much as this new logo. By stripping down some gradients and the flashy flashy unnecessary crap from IE9's logo it became, IMHO, by far the best they have ever made. Aero was flashy and awesome in Vista, then got stripped to a boring Windows 7 look, but now this new logo, and the concept that stands behind it in all Microsoft products, aims to be simple and pretty; in other worlds: subtle!
Not having a blindingly flashy fancy logo anymore doesn't mean a thing. Once again, people are just over-blowing things out of proportions.