Got it and had a bit of a play.
The start screen replacing the start menu didn't annoy me as much as I thought it would. With a little getting used to I don't think it is a major deal.
The bigger problem overall is it feels very much like it is trying to do two things, and not well at each. You get the Win7 like underlying features, although many bits have been given a polish it's fundamentally the same.
The new tablet like mode... doesn't feel right with a mouse. Maybe I haven't got used to it yet, or worked out how to best use it with a mouse. The sample apps, which are clearly marked as samples, work ok and look ok, but a bit of a waste of space on a 1080p screen. I wonder if in future there's a place for touchscreens on desktop? Not replacing a keyboard an mouse, but supplementing it. Actually, maybe just replacing the mouse. But as anyone who's used a tablet before, an on screen keyboard no substitute to a physical one if you want to use it more than a little. Even using a touchscreen monitor to replace a mouse input would raise a lot of new ergonomic questions that needs good answers.
That might be getting a bit ahead of ourselves, and might be something for Windows 9.
Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 70-300L, 100-400L, 100L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.