Watched this on the recommendation of a Uni lecturer. I thought it was brilliantly acted, the story was paced perfectly, and understandable despite the complexities (political intrigue not usually my thing). That is at least until the last episode when gaping plot holes appeared and half the characters that had been set up in the last 5 episodes were just forgotten about. I didn't buy the resolution - it came out of nowhere and I wasn't convinced that the person taking the fall was really guilty. Not with what they were charged with anyway. There was no resolution for even some of the major characters (most notably Anne). I felt ripped off.
That said, I would watch this again just for the performances. David Morrissey was superb and Bill Nighy is always a great laugh.