I finished season 2 last night and loved every minute of it. It might even have been better than the first season.
I liked the parallels between Tench's kid and the subjects they study and found the methods of the time in dealing with such problem cases fascinating. I loved the politics, both in Atlanta and internally with
Gunn who could be a double for a general manager I once had with the exact same slimy, manipulative and ladder climbing nature. I even enjoyed the insight into Wendy's balancing of her personal life and career goals, it felt more sincere and nuanced than the usual token diversity storyline we get in modern shows.
I said it in another thread and
@kouroux mentioned it but the casting is absolutely superb. Berkowitz, Kemper, Manson and Williams were all perfectly cast and while I'm not familiar with the SM killer in the last (second last?) episode, the actors performance was haunting.