Shame I can't recommend this series to anyone anymore. The first season was amazing. Interesting plot lines put together with care. Great acting. Fantastic use of mini plots scattered through the show (particularly in the openings) to give information about the world this is set in and to provide contrast where needed to the way characters were responding. In some ways I actually think the show was better than the books, something I almost never say! Might be a bit confusing at times for those not up with their mythology but it may also keep the mystery more too that way too as they drop hints from episode 1 if you know what to look for. This is a show you need to watch, rather than half pay attention to. (I'd give it a 9/10).
Season two started showing cracks. Sounds like some drama happened behind the scenes and they lost characters that hurt the show. Still, they seemed to be trying to pick up the pieces and it looked like it was going to find its way through. (Maybe a 5/10)
Then season three happened. It's mostly awful. The storyline is all over the place and sometimes it seems like they just decide to substitute interesting story for long drawn out scenes of "adult" activities for.... reasons? Most of the characters become boring to watch and the show had completely lost its way. Such a sad end for a show that had so much promise initially. I'm not surprised it was not renewed for another season. (Score 1/10.) Watch the first season, skip the rest if you can handle leaving a series unfinished.