Thanks for the advice Drew. I have two more episodes to watch from series 2 and then I need to decide one way or the other.
Season two has differed from the book quite a bit (not in a bad way), but the major plot points have (I'll assume after next week's finale) been hit.
My girlfriend keeps saying 'it didn't happen in the book that way, they did this etc. etc.' but she is also really enjoying the series even though she is a big fan of the books.