I find the interface inefficient
For a desktop user the new UI is less efficient than the Windows 7 start menu. Unless this is corrected for launch then I fear we are seeing another Vista on its way. I have nearly 2000 users to think about and support - I cannot see the new UI as being anything positive when compared to the amount of frustration, training and support calls my team will have to field.
Windows 8 looks slick for touchscreen devices, but unless we move the workplace away from desktops and laptops then the new UI is a possible show-stopper and I am likely to keep the enterprise on Windows 7 for a few more years.