And yes, redirection of files and directories. Their "Virtualisation" of the Program Files folder is one of the worst things possible, as it simply eats files. The files programs put there are moved to another folder and made invisible to the user. In what way that helps security I have no clue. It's pretty much worse than silent IO failure. Thankfully, with a bit of fiddling around in the registry or the Management Console, that can be disabled.
And then there's the "library" feature, which is an attempt at implementing something like bookmarks. It works fine most of the time, but you can't go up a level from there. At all. And you can't even copy the real path of it easily. It's quite frustrating.
That's on Windows 7, though. Not sure how they changed it in Win8, but I'm definitely not going to find out any time soon.
At least they now have ReFS... ...except it's only on servers. What else is on servers? Metro UI. Yeah...