I don't really know what to say about this series. I really enjoyed the TV show and not so much the book series. It is something that does not happen really often... I guess I shouldn't have started the TV show before reading the book series. the TV show has way more content than the books and is much longer.
If you do not compare it to the TV show (which is now impossible for me), the book series is quite fun to read. The idea and the world created by the author are great, I love the concept. The characters are also great and well developed. But I just could not stop comparing them to the TV show characters, who are not the same at all. That was confusing, especially at the beginning.
I guess it's a great and original book series but the TV show made it look flat and that is such a shame. I still recommend reading this (even more if you have never seen the show!)