It's the best looking game I have ever played so far period.
Nothing, not even Doom3 has looked this real or has been this immersive. I can just imagine what it would be like on HD, but even on standard it's stunning when you see it in real life. The screenshots really dont do it justice. It's hard to understand that something that looks this good could even be a game.
The combat is hard to manage at first because it's a different style than other games, but it's super easy if you think about how you would react in real life if you had a sword and shield (or whatever) instead of thinking how the game allows you to react and act within those parameters.
The inventory, skills panels and everything that encompasses your character's details are laid out pretty well and the map stuff is very nice so far.
I've only completed the tutorial portion that shapes your character's class and sets up the main story for you. I took my time and really played with everything and I had about 2.5 hours to play last night.
You start in prison and eventually make your way out thru some underground areas and thru the sewers and into the main city and that's about where I stopped. I didnt actually go into the main city and when I exited the sewer it was dark and foggy out, so I havent seen the truly expansive terrain or anything yet, but I am dying to see it.
The magic skills and stuff are basically how Morrowind handled it, so that's not a huge change from how they normally handled it and you still have health, fatigue and magicka to monitor and to be a source for your actions. Playing Morrowind first definately would give someone a leg up into understanding this game (and just how deeply complex it is). It might be kind of daunting for someone who's picking up an Elder Scrolls game for the first time.
So on a scale of 100%, I think I have only experienced about 0.005% of the whole game so far. I cant wait to see more and experience the huge terrain and "living" world thanks to the Radiant AI, etc.