I'm missing it too!
I finally watched it all and I think that, objectively, the actual spy/intelligence story was basically a lot of overly complicated and far-fetched hooey. And I can't decide whether the ending was more like Thelma and Louise or Butch and Sundance.
But it was saved by how beautiful and moody it all looked and sounded, and by the performances –I think Ben was genuinely brilliant, and loved Charlotte R and Jim B particularly as well.
It falls apart once you start to analyse it, but go along for the ride and it's very enjoyable in many ways.
I also agree with those saying that the spy stuff seemed to matter less than the love story/stories. I think it was a bit of a meditation on what it means to love or to not have love, and on how difficult it can to really know people even when you think you're close to them.
It was also about truth and lying, and how we lie to and conceal things about and from ourselves as well as others.
Highlights for me include: the first episode (all of it); Scottie's beautiful house and art; London looking alternately buzzy and busy, and derelict and lonely; Ben W in that suit the escort agency made him put on; the freezing-looking, washed-out scenes with Danny and Scottie on Hampstead Heath; the HIV clinic scene when Danny waits, on his own, twice, for his results (a mini tour de force) and the scene where Danny tells Alex about his night of psychosis when he invited the world and their dog round. Unrelenting close-up, his need for truth and forgiveness/recognition, and heart-rendingly beautifully shot; you see so clearly the pain and shame but also relief in his eyes. He looks like a wrecked angel.