I found the Metro system to be more clunky. How to search on earlier Windows versions: Click Start button, the Search bar is instantly marked so you can just click the Start button and type. For W8 you have to pull your mouse to one of the corners on the right side of the screen, pull your mouse over to the Search function which can be a pain in the ass if you're doing sweeping moves and accidently sweep away the right-side bar, then click the Search function and then type. I would've liked it if there simply was a search bar on the bottom of the Metro screen, that would've been more effective and it would've still looked good.
As for casual users, I don't think that's a great market, because casual users will just use whatever OS they're comfortable with. The only casuals who'll get these computers are the ones that buys an entirely new one in the future when computer manufactorers have started putting W8 on their computers. It doesn't feel like a winner OS to me.