I can't remember ever feeling so uncomfortable watching a TV show. It's brilliantly made and captures what I imagine was the feeling of the time which was horror, paranoia and confusion. The scene where the pregnant wife is comforting her husband in hospital while he lies literally melting into the bed is something that will stay with me for a while.
The series does get better as it goes on. Oddly enough the first episode is the slowest and that features the actual explosion.
Some minor gripes. Why do they all speak with English accents? Surely even asking the cast to put on generic eastern European accents would have helped with the realism. It's an odd decision in an otherwise very authentic show.