Part of it is that it's just an exquisitely written/filmed piece of television

And a number of the episodes are directed by Susanna White, which was an important factor for me, because women directing war shows/movies (ie. The Hurt Locker) I think is a really important thing. That's really hard to explain. How my brain works with regards to this. AHHH NOT MAKING SENSE. D:

There is a comment I want to make about it, but you (exsequar, obvs) have to see the last episode first because it's kind of spoilery in a way because OMFG HEARTBREAKING. Jfc.