This is an interesting concept with some original and a fair bit of derivative stuff (think 'Walking Dead'). The cinematography is truly exceptional, with some awe-inspiring scenes.

The writing is a bit patchy and gets bogged down a bit but has sufficient gravitas in relevant areas to be convincing.

The direction is very patchy. For example, there is some some truly superb direction - such as Peter Hoar's direction in episode 3 (a real masterpiece), and some risible direction - such as Liza Johnson's truly embarrassing effort in episode 7.

The acting, as always, is as good as the direction.