That's a very interesting article there. The thing that bothers me the most about OS X is how it looks so monochrome (and, by my definition, boring and less usable), like it's mentioned on the "Less color" section. I like to use color from icons to guide myself and by going monochrome I just can't do it. On the opposite side there's Google's sidebar which has so many colors mixed-up that it's as usable as Apple's monochromatic style.

One can easily argue that monochromatic UIs are less distracting though. But it does remind me of USSR architecture...