The first couple of episodes perfectly set the scene and were absorbing.
Unfortunately, episodes 3 and 4 could have been cut altogether as they concentrated on personal relationships which, in context, were of no real interest. The last four episodes focused on the main storyline and I think they were well paced, leading up to a finish that was not really predictable.
Some events were not explained to a conclusion, but I don't mind being left to think about the possible scenarios.
In conclusion, 6 episodes would have been better than 8.