| I've been playing the game for a few days, and I really love it. It does remind me quite a bit of Oblivion, but I think they've really improved on the formula AND added in Fallout flavor. One thing that I really like is how they've removed the scaling feature that Oblivion (and Morrowind to a lesser extend) had, so if you wander into certain places when you're a lower level there's a chance you might be unable to clear it out.
And, to answer a question above, you basically crouch to enter stealth mode, and a little text thing says "Hidden" if nobody sees you, "Detected" if something sees you but isn't trying to attack you, "Caution" if an enemy hears you but can't see you, and "Danger" if you've been spotted and are under attack. | 
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