The problem for me (at least) is that it is to different from the book series.
Not that the book series is really good, it ins't (although the first books are quite passable fantasy-books), but there is a little voice from the books in the back of my head that screams "This didn't happen in US!" all the time.
I will see the series eventually, but I wait until the season is over and watch them all over a few days. And try to be impartial, however difficult this will be.