It's probably permissions assigned to the OU through Group Policy. Have a look in Group Policy Management on DC and compare what group policy objects are assigned to both OU's.
If you click on the GPO and settings tab, it generates a report showing what is set.
I agree it has some new features that are good, like the mount ISO in Windows Explorer, but i think there needs to be a option to switch between the metro interface and a normal start menu.
Why would Server 2012 need a metro interface? It's a server, you wont find it installed on a tablet!.. I don't think Windows 8 or Server 2012 will work well in enterprises.
I'm on giffgaff, pay £10 a month and get 250mins, unlimited texts and unlimited data. Really cheap and hasnt let me down since i got it (March). Giffgaff to giffgaff calls and texts are free so long as you top up every 3 months or more.