Some of the tips in this article are great and the more you dig, the more you find they actually HAVE improved a lot of things in the 'old' OS as well (this seems to get ignored/glossed over in alot of reviews, especially the negative ones).
So far, Metro/Win8 is just a toy without touch. I honestly can't see myself getting much work done here but it seems to keep out of the way enough.
Ultimately (for me), would I use Windows at all unless I had to for work? And would I replace OS X 10.8 with Win8 as my primary OS? Quite simply: hell no. You'll have to pry this rMBP out of my cold dead hands (not just because Retina is such a game changer visually - I still MUCH prefer the speed, power, efficiency, apps and overall experience of OS X. It's no competition IMO).
Whether Win8 is a winner on touch devices like Surface, time will tell. Metro/Win8 is nice enough but there are next to zero apps for it. I'm also still not convinced having the 'old desktop' on a tablet really is what people are going to want. Obviously it's a stopgap until Win8 takes off but is it really much of a selling point? Anyone who has done RDP or Citrix from an iPad can get an idea of what it's like (I've used it enough times to know): It's OK in a pinch, but shoot me if I had to use it to actually get serious work done.
Microsoft have definitely thrown a Hail Mary here, not long to find out if it will work...