I almost decided not to watch this as it was rated 5.6 overall but then I read a 10* review against a 1* review and knew I had to watch it. And I'm so glad I did. This is an excellent black comedy with a great plot and some very funny one liners.
Of course, I understand perfectly why some people might not take to this; black comedy is not to everyone's taste.
However, anyone who derides the acting just because they don't like the script is entirely ignorant of the craft/art of acting; this is a cast of superb actors and they know exactly how to play this script. I look forward to the second series.