Well, this episode seems to have potential in its synopsis... but then I see the writer is Peter 'the Moon is an egg' Harness. Now, I know I shouldn't pre-judge and I acknowledge it's poor form on my part... but when I see the Radio Times proclaim it as 'the best - and most political - Doctor Who story in years' I instantly become extremely wary, not merely because it's such a lofty claim but because Harness wrote one of Doctor Who's most egregious ever cop outs last season in 'Kill the Moon'. And when I say 'egg-regious cop-outs' I'm not merely punning, I'm deadly serious.
Harness wimped out, well and truly. He moralized and then spun his fictional scenario to justify his morality. That sort of dogmatic approach to a serious theme does not bode well. I do not trust this man to write a fantastic 'political' story. What I expect is a sermon with events contrived to demonstrate the rightness of his point of view. It has the potential to be even worse than 'The Happiness Patrol'.
I hope, of course, to be proven wrong. But... look, anyone can write a bad script. But Harness' script was not just badly executed, it was misguided writing. Moralistic, not thoughtful. Whimsical and yet with pretensions of being serious drama. All kinds of things which upset my sensibilities. I don't think the man who wrote that episode can write anything I will find thought-provoking. He's one of only two Doctor Who writers who have offended me with their ill-judged writing (can you guess the other one? Regular episode thread readers will know who it is

)
This is honestly the first Doctor Who episode in years I think that I actively do not want to watch.
(I'm also irritated Osgood is back (I don't think that's a spoiler; it's been highly publicized). I know she's probably a Zygon but I was in a minority of people not impressed by this fan service type character and I'm not terribly impressed by the fan service act of bringing a version of her back either)