There's nothing wrong in introducing the "touch experience" to the OS interface. But even if it was desired, the UI should not have been made so that it becomes an almost mandatory feature. It is only good when working on small screens that fit in your hand. Good for smartphones, good for tablets.

But now? We've got also giant screens and notebooks and desktops, for which the touch interface will EVER remain almost unusable or unpractical. And that's the bad thing about it.

The Windows 8 UI is really ugly on large screens, it does not display enough things, and makes all operation longer to realize than before.

What is worse : if you don't have any touch interface on your PC, now you need to point your mouse on extremely tiny screen areas, without any visual hint just to perform basic operations.

And why is the UI so poor with 2 colors ? Why isn't there the keyboard shortcuts we were used too ?

And why text input has been alsmost completely removed, forcing us to slide tiles on screen just to find and select an element ? Why do we need to always scroll on screen? Didn't Microsoft learn from Web designs that having to scroll to find the relevant content constantly was a bad design ? The important and most used items should be visible on screen.

Windows 8 has been made for smartphones and tablets, or for browsing contents in the Media Center for sites like Youtube, where the main interaction is just about BROWSING available contents randomly. It is not made for working on any content. The UI is also not customizable at all as at was in all past versions.

And if this was not enough, the applications (NOT JUST the menu) that use the tiled interface are now extremely slow to startup. And this interface is also extremely unstable and crashes almost constantly. I really hope that most applications won't use this interface, or that it will just be an optional featured view. People still want to have a more classical interface available for EVERYTHING that is about content edition/creation: at work, we don't spend our time just browing contents randomly, we need to work on forms, we need to be able to integrate various contents from various sources. The keyboard is NOT an option and nobody will like using a touch screen just to create a document. Even if this is in Word or Excel. Microsoft is even killing its own Office suite.

Windows 8 is just meant to be used like a web browser for viewing contents created by others. Or just to play some games. Really not professional.

Additionally Windows 8 does not work correctly in a VM for virtual installations as a guest OS. And this is unexplainable given the poor display requirements it needs for just displaying a few things.

Even the most basic games for Windows 8 are crashing constantly : just try Freecell on Windows 8 : not only it consttantly takes minutes to launch, but also it first required you to create an online account on the Xbox site, but there's no way to terminate any game : the game crashes after just a few moves, just because there are SO MANY implementation bugs in this unstable interface. May be you don't care about those free games but they are supposed to demonstrate the usability and stability of this interface, and the demo has failed completely ! This is just enough to justify that application developers should NOT develop anything for it, and that they should continue to use their own designs.

IF you want a really usable touch interface, better look at what Google proposes : it works, it's fast, it's reliable and won't crash, it's visual design is also much better and does not look like a childish game for people under 8 years old. With Windows 8 we really feel that Microsoft consider us as stupid uneducated people. And still its interface is completely unintuitive.

Finally I don't like putting my fingers on the surface of a screen : greasy tracks will look ugly, and we'll contantly need to cleanup the screen.

Windows 8 is just horrible, unusable, unintuitive, full of bugs, slow, it requires too much gesture with just a mouse and no touch device..

what was the Microsoft intent when reinventing an interface that is just a lot of menus? Even if this interface was made for being usable wth a finger, it does not change the fact that it is just a lot (long) scrollable menus