We've got about 3k workstations here and about 1k virtual desktops.....all running XP and Windows 7. Windows 8 was skipped in the last hardware rollout because of compatibility issues due to their poor design considerations.
Mostly, the learning curve was too great at the time of deployment, so it was decided not to make the switch yet. If they add the start menu back, that will likely give them a chance again.
What bothers me most about windows 8 and 2012 server is when I need to edit a file with UAC enabled, I want to start notepad...I have to run it as administrator and that takes me typing "notepad" in metro, then right clicking on it.
If I pin it to the start menu, that's great, but right clicking on it to run as administrator means I have to click "run as administrator" at the bottom of the screen. I'm moving my mouse all over the place to do what I used to be able to do in half the time and a third of the mouse movements. It's simply inefficient and cumbersome....same for many of the menus. I'm sure it works great with a touch screen on a surface.