Just finished watching it all. Incredible series.
A couple of things struck out. I loved the dynamic of the family. How they couldn't agree on much but came together when they need to.
I loved how in the end Edith and Muriel came together and bonded. Originally it felt like the cliche mother in law/daughter in law relationship.
I felt increasingly anxious as I watched the episodes and the speed at which they raced through things.
I also like how RTD didn't make a huge thing about gender/sexuality and disability. The storyline between Victor and Daniel was believable and compelling and Daniel's death was so upsetting. Luckily I kind of spoiled for it myself.
Vivian Rook looked terrified at the end and desperate. It was obviously she was a puppet being controlled.
I also found the BBC being suspended unsettling.
I never realised about concentration camps. It wasn't taught in my history class when I was at school and I left 15 years ago.
It all felt very close to home for me.
Finally, I liked the ending. Steven Moffat was the one who wrote Silence in the library/forest of the dead which had River Song up loading herself to save the "saved" (big doctor who fan and River song fan hence the username)
My favourite character ultimately is Edith. She did what was right in the end.