A game which really draws you in.
I found the world to be very engaging, and realistic.
The game play could be very frustrating in the early levels if you're expecting to be able to go anywhere and do anything within the first hour. I found that you really needed to learn to fight properly, and learn the behaviour of each foe you went up against.
The day/night cycles, and the weather and ambient lighting/sounds are very engrossing and really draw a player into the game.
The one major drawback of this game are that there are several points where things get glitchy. This is somewhat do to the game being open ended, and if you explore the world a lot before you're "supposed" to you might encounter more bugs then if you follow what you should be doing.
Overall I'd recommend this game to anybody who likes RPG's.