These devices didn't exactly sell like hot cakes, did they?
And why? Because MS took a desktop GUI and slapped it on a touch device. They added some hacks to it, like hand writing recognition, and et voila, they created the tablet OS! They even had a unified GUI, because it looked just like its bigger brother on the desktop. Too bad it failed though, despite being on the market almost a decade before the iPad.
Same with Metro. This time it's just the other way around, take a tablet GUI, slap a few hacks onto it.. and sell it on the laptop and desktop. Profit.
Why should it be different this time?
Just like XP was a hack on the tablet, Win 8 is a hack on the desktop. I would love to read the reasons why "this time it's different! honest!".