I think what bothers people is that it has a learning curve. You can just jump in but many of the things you grew accustomed to accessing a certain way aren't readily available since there's no start button with the commiserate popup program menu.
I love it. You can easily flip to a regular desktop window if you have a mind to and once you get the hang of it I doubt you'll want to. I like having the open windows that you can arrange, the easy access to scores of free and useful apps you can pin to your taskbar (in the old view) or those boxes. The disruption is mostly about different shortcuts. Initially, say you wanted to power down. It can be a little more complicated until you put up shortcuts. Have you taken a look at one running it, say at BestBuy yet? You should. I love the way you can pull together so much media in it. Best thing since XP to my mind.