The Metro interface is not designed for traditional mouse/keyboard setups. It can't have been. It's specifically for touchscreen devices. I've tried the pre-release version. Usually I can tell after a day or two if I'm going to warm to a new interface, but I gave this one the thumbs down. There's no way you're going to prefer this over a traditional desktop if you use a mouse. Let's face it, the desktop, the start menu and the task bar are pretty much ideal, I really don't see what's wrong with them at all. There is no program on my computer that I feel is inconvenient to start up this way.
Microsoft look like they've decided that the mouse has had it's day. That's crazy. There is no way on earth people are going to be using a touchscreen for the kind of intricate work that a lot of us do. Can you imagine messing with control points on an Illustrator path, using your big stubby fingers? Also, who wants to reach over and prod their monitor every time they want to make a selection? I can understand the attraction of touchscreens in some situations. My phone would be useless without it. But to place a bet on the touchscreen replacing mouse and keyboard, ranks up there with every other embarrassing tech prediction that we've laughed at 10 years later.
If there was an option to boot directly to the normal desktop in Windows 8 then I wouldn't mind. Keep Metro there for people who actually need it. But apparently there's not. You're always going to go to that godawful tiled screen first. My money is on Window's 8 being part of the Microsoft tradition to screw up big time every alternate release.