I've been trying to use the Metro UI, and I simply can't see the benefit in an office environment. It's kind of dumb how they are forcing users to use the Metro UI. Start8 from Stardock restores an extremely similar start bar that was used in Windows 7. (Costs $5, the best one I've found.)
Some good things are better multi-monitor support and automounting ISOs.
I think you're on the right track, Gene. I haven't found anything that would make it worth upgrading. One of things that ticked me off is that they are going to start charging for Windows Media Center. Charging for an already developed feature that's been there since XP. Even if you don't think you're going to use it, they are currently giving away keys for free:
http://windows.microsoft.com/en-US/windows-8/feature-packsI've basically been spending time to make my Windows 8 identical to Windows 7 ha.