I watched this in its entirety when I was with my family on Christmas. Pretty good. I still don't know if I'm sold on Tom Hiddleston as James Bond (frankly I think Idris Elba would be better), but this was a good adaptation of a good post-Cold War Le Carré novel.
It's smart and well-paced. Not at all action heavy but it's Le Carré, so you already know that. Overall, well done. Plus it had that awkward 59-something British chick from Broadchurch -- essentially reprising her role on Broadchurch only with spy stuff instead of small town murder stuff -- and I like her.
One thing that was exceptional about it was the cinematography and camerawork. It's absolutely cinema-level. Moreso than Breaking Bad or Game of Thrones or Sopranos or anything else I've really seen. Flows together like a film, could have been directed by Ridley Scott. Very crisp, very clean, no shortcuts.
4/5 if I had to give it a rating. Not really my conceptual cup of tea, but it certainly pulls you right in.