In my opinion 4 stars is enough. I feel that the first series could have been told in 4 to 5 episodes. Yet the second, a few more than the 8 as it had far more context and characters to cover. I did really enjoy it but took a few episodes to really draw me in - after that, I was hooked. I wish there was another series to continue with the next 'dimension' - but then, where would it end!!?