Are you not a sci-fi fan? As a sci-fi freak, nothing was as exciting to me as the transformation of Julia in the last scene.
I love fantasy, middle of the road on science fiction but certainly can enjoy it.
But this show is a B tops for me. The protagonists (Joe and Juliana) aren't good/miscast while the best two characters are a Nazi and Kempeitai respectively. Tagomi is decent as well.
The fact the show runner had to change mid-season 2 says alot. Season 3 is definitely better than the first two, but the whole Dr. Evil and his big time machine weapon displayed in season 3 put me off
Meanwhile, the eugenics, propaganda, and Year Zero storylines were far more interesting and scary at the same time (although i agree with the reviews that Himmler is a bit cartoonish- "purge!").
If S4 is the end, I'll probably watch but otherwise leaning towards moving on.