Re: [$application] is a Metro app.
Good. The WIMP-based desktop metaphor is an anachronism and the mouse has been a pain in the arm (literally) for decades now.
Also, forget using Windows 8 on a traditional desktop, because traditional desktops haven't been selling in any great numbers for years now. The vast majority of computers sold today are laptops, or related form-factors.
Windows 8's Metro on a laptop fitted with a decent multi-touch trackpad makes a hell of a lot more sense than Windows 7's ageing lipstick-on-a-pig WIMP system does. As others have pointed out, Windows has a major issue with focus-stealing—that's one of the reasons I eventually gave up and made the switch to another platform. I hate that focus-stealing.
Furthermore, every f*cking Windows application seems to insist on adding yet more icons to the system tray so it can notify me whenever it's done something right—"Hi! I'm your anti-virus scanner! I've just finished scanning your drive and slowing down everything else! I hope you don't mind my interrupting your 'flow' by making this utterly pointless announcement!" Shut the fuck UP! I'm WORKING you arrogant, incredibly annoying bunch of bytes!
Every bloody program insists on using its own updating framework too, so every goddamned time you open a PDF, or view a website with a Flash element, or open a Word file, or start Open/LibreOffice, instead of just letting you get on with it, the damned thing insists you install the latest update. And then it makes you wait while it does so.
Would it kill developers to have their application offer to quietly download and install these updates behind the scenes, so when you next start the application, it's already bloody updated and you need never, ever be nagged again?
And people wonder why Apple's App Store model is so popular: it unifies the updates too, so you can see if any are available at a glance from the icon in the Dock—a "pull" process—without the nagging, and you can choose to install any, or all, of them at a time of your choosing.
But I like Metro. Seriously. I've used it on Windows Phone 7 devices too and it works even better there. It still has a v1.0 feel to it, but even the first versions of iOS and Android had their rough edges. As a first effort, I think it's a good one. It's certainly more original than Android.