I tried the developer preview, I dare say that it's awful. After seeing videos about 6 months ago of Metro, I thought it looked like a stupid way of doing things, but deep down I was wondering if it would just be brilliant when i tried it hands-on; It was not.
It's designed for tablets and touch screens. I would argue that it's not even very good for those. However, a keyboard and mouse are still superior input devices for productivity, and I'm certainly not going to hold my arms out all day poking at all 3 of my monitors at work. Tablets are a fad just like netbooks were, there's even some statistic that 75% of all iPads are just collecting dust because people figured out they were useless when you've got a laptop and a phone.
"YES!!!! YES!!!! The world is finally ours!!!!!!!!!!!" -Linux users and developers all over the world