I'm way behind, as always - but guh.
That last scene has killed me dead. Forget the drama and content for a moment and just marvel at the direction! The intercut scenes, the music, the delivery - WAH! And then the order for them both to die. Well, it can't happen, but I'm annoyed that I need to work now and can't watch the next episode before I go out.
I kinda hate how they've put Kara and Lee on simmer, but it had to be done - they couldn't maintain the acceleration of that relationship without them ending up married and expecting by the end of the season.
It's all complicated, and such thought-provoking, intelligent science fiction. Beautiful - I'm still happy with this series.