I manage about 100 Ubuntu servers at my job, and they're fine, but that's not the desktop model, it's the server model. I've tried using their desktop, and Unity, and while it's different from Metro, it's not a lot better in terms of function, for my opinion.
I dunno, man, Linux is wonderful, I use it every day and love it most of the time, but it's not Everyman's OS and never will be as long as Windows and OS X are around.
The problem with Ubuntu is using it with peripherals that require editing system files to get them to work.
I’d like to see Ubuntu for handhelds -— Phones, Tablets, etc.
In the *nix world, I cut my teeth on the GNOME and KDE desktop, as used in RedHat 6.1.
Unity on the current GNOME desktop is not particularly intuitive...it’s more tablet-oriented, IMO, than even Windows 8 Metro!
At least you can return to Windows Explorer simply by pressing ALT-TAB.