Just got it and played it all day yesterday. Truly an amazing next-gen game that puts some tough demands on your system. It's genuinely open-ended, and there's so much to do in the game, it could swallow your life. It's hugely in-depth and not for the impatient. Leveling up is a labor of love and time.
One thing I don't like is the way NPCs insist on saying something when you walk past them. Can't they just shut up? Other than that, I can't find that many faults with it.
Controls on the PC are standard, WASD + mouse look. Combat is good - pretty intense and much more like an FPS than a random number generator.