There may be a 'fan factor' at work here, as I've spent some time immersed in George Martin's Westeros prior to buying this game... so my review may not be completely impartial.
True, as others have commented; the graphics are not cutting edge. They are adequate though, and the environment created in this game actually feels quite true to the books / film. The 'sets' in some places are actually quite jaw-dropping (Kings Landing).
The story is (for an RPG) quite intricate, and ties in quite well with the 'feel' of the books, as well as the storyline in 'Game of Thrones'. The cameo of the author was amusing too.
Though it has also come in for some criticism, I quite liked the battle system; blending as it does an element of real-time with an element of turn-based. Queuing up complimentary moves between your player characters (and the warg!) to maximise your edge in battle is quite rewarding.
I've done all four endings now, and not even a whiff of Disney. Very dark indeed, and better for it.
In summary, I'll give this four stars. If I hadn't just played LA Noir and Red Dead Redemption it would get five. Finishing it has left me a little bereft, as good games should.
Shame they couldn't resolve one of the four endings to leave an 'open-world' game, like the above mentioned titles... perhaps blending in an element of 'Risk', so to speak - you you could participate in the chaos after Robert Baratheon's denouement, call the banners etc... Maybe I just want the moon on a stick.