Whether Win 8 will be a success is still up in the air. But like many here, I initially didn't like it but felt I needed to learn it so I could service my customers. I installed Win 8 Pro as a dual-boot with Win 7 on my laptop. The plan was to use Win 7 as my regular system while learning Win 8.
After 10 days, I now find myself using Win 8 full-time and actually really liking it! I'm using it for all my normal support jobs, on-site work at customer calls, etc. There are some areas that I'm still feeling out, but must say that Win 8 feels quite a bit faster than Win 7. And this is on the exact same hardware (Dell Latitude D830, Core 2 Duo 2.5GHz, 4GB memory, 500GB 7200rpm HD)!
How was this possible? The Classic Shell free programs that allows you to make Win 8 look and work like Win 7, including a start button. (
http://classicshell.sourceforge.net/index.html)
I'm playing with the Metro interface, but 90%+ of my time is in the Win 8 desktop. Some may think it's cheating not to use the Start screen, but let's face it, it's designed for a consumer user, not a power user like we are.
Also, I've setup almost a dozen Win 8 PCs for customers and many of them have opted for the Classic Shell. Word's getting around and I'm getting new customers because of this.
Maybe not what Microsoft was envisioning (force us to use the Metro interface), but hey, you do what you have to do.
p.s. I have a couple of XP-era personal programs that when run in Win 7, would force the video into basic mode, but they run perfectly under Win 8.