Closing apps is also more difficult. On the desktop you just click the big red button and the window disappears but in metro you're required to click the top of the screen and drag the app to the bottom of the screen. It's a lot more work and it's frustrating.
The interesting thing about all these frustrations on the PC is that on a tablet they'd be great! Metro is a great tablet UI. It's optimized for touch. This is clear so why force it onto the desktop? This clearly demonstrates the difference between Microsoft and Apple's philosophy on user experience. Microsoft is cannibalizing the desktop user experience to realize a utopian vision of one OS to run on all devices. If Windows 8 on tablets is a massive success then maybe to MIcrosoft that would have made it all worthwhile. People could always go back to windows 7 on the desktop if they prefer to. Maybe this is Microsoft realizing that we are indeed in a Post-PC era and it needs to succeed in this space at all costs!
It's actually the opposite, the virtual target area extends beyond the screen to the bottom and left and that area has no boundaries. In other words, you can move your cursor in the right direction and if you keep moving you are guaranteed to hit that area. Experienced users will just 'flick' their cursor in the general direction knowing they are going to hit it.
If you want the classic windows desktop experience, it's right there, isn't it? You have no one forcing you to use Metro if you don't like it.
The 'integration', if you can call it that, is definitely no where near what it could be (task switching in metro and classic desktop are two different systems). They also introduce many new interactions for metro, that even I didn't know about till people told me (hot spot in top right, right click to access IE 10 metro controls). Of course, most touch based systems have these kinds of problems, but the question is will they be consistent across metro.
So really the best description of the system is Windows 7 with a new start dialogue that takes up the whole screen, can start applications itself, and even has its own task switching; all with some added sugar to the rest of the OS.
I can't see Win8 being ready before the end of the year…