Show went downhill during Season 3
I really enjoyed the mini series/season 1. Season 2 was enjoyable. Season 3 was awful. I started rewatching it on Netflix and about halfway through season 3 went "oh yea, this is why I stopped watching this show."
I'm doing my best to finish season 3 and start/finish season 4, but Isabelle is just awful. Not awful as in "bad ass villain" but awful as in she should have never been aged. I absolutely cannot stand the character and how the show started to revolve around her.