If you don't like Metro, it's pretty easy to get rid of now but not entirely (it occasionally pokes you in the eye). My setup guide:
1. Use group policy editor to get rid of lock screen.
2. Set IE to open tiles on desktop.
3. Set start menu to display apps only and turn off hot corners. Then set to boot to desktop.
4. Uninstall all the metro apps that come with it.
You will still get the "start screen" but in apps view and the search stuff but to be honest it's pretty good. I rarely see it though as everything I use is pinned to the taskbar.
Use Windows+X as your new start menu afterwards - it rocks. In fact I wish earlier versions of windows had that!
Reasons to upgrade: faster boot, power management seems more stable, Hyper-V, explorer UI enhancements, nicer file copying, new task manager, better Powershell integration.
PuTTY and Firefox still work which is the most important thing for me though...
Edit: just to add I haven't installed a start menu replacement or metro killer.
Edit 2: I haven't figured out backups yet. Windows 7 backup was trivial with an external disk.
Edit 3: to bypass microsoft account login/creation on installation (I did this on Pro edition):
1. When it asks you to sign in, click "create a microsoft account".
2. There is a link at the bottom to "use a local account" on the page this sends you to.