People fear change, I didn't like Steam when it came out but it just kept getting better, Origin numbers just come from forcing registered EA titles onto a persons 'Origin' account. While Steam numbers are really customers.
But Windows 8 is a big change underneath too, there's no way to get those kind of benchmark results with a simple reskin of Windows 7.
I drive right by their HQ all the time.
15090 Beck Rd.
Plymouth, MI 48170
Windows 8 = attempt to leverage desktop OS near-monopoly to take a major chunk of the tablet market where iOS and Android rule at the moment.
Previous attempts (pen interface in Win7 and Vista) were obvious epic fails, so they are going for more radical approach. And hey, Metro may be a fine UI for tablets and phones, but it is terrible on the desktop and forcing it on the desktop will blow up on MS face.
The OS has some nice features apart from the UI so I really don't know what to think about it. Will probably not upgrade though.