I'm of two minds on the finale.
Personally, I loved all the character moments. The dialogue scenes, and the character resolutions. But I thought the plot felt..cliche and sloppy. I kind of hate that the killer kind of fell into the "horror" movie tropes. It felt very by the numbers. You got the weird opening where he's talking in a British accent, and his weird behavior (to establish his Buffalo Bill(ness). Then you have his house scattered with "creepy" looking dolls. Then the entire segment where Chole stumbles through his layer (that looked like a Hollywood set, killer layer by the numbers). Basically, the entire thing felt to me like, a horror film in the worst kind of way.
I would have preferred if this confrontation would have played out a little differently. That the final show down would have been more intense and kept a bit more grounded. One reason I really liked the Ledoux confrontation was because it felt abrupt, sudden, and violent. It felt like this just happened in the moment. Now, I know this is the end of the story. And to have a confrontation like that with the main killer would have felt lackluster. But I still think they could have done a better job just framing all this up.
I get that ultimately, this was about Chole's journey. That him going into the layer, was him confronting the end of his journey. He went in with the mindset that he was meeting his end. But this entire segment just rubbed me the wrong way, and again..just felt like a cliche horror film. *shrugs* I don't really have too many complaints about the overall case and the mythology. Most of it was already wrapped up last week. Tuttle was dead. Childress died. Pretty much everyone involved in the ritual sacrifices that we knew of were out of the picture by the end and Errol was the only one left (not counting the senator).
Really there was two plot points going on here. You had the ritual sacrifices of this secret society. And you had Errol going off on his own, feeding into his religious killings. Errol was a serial killer that lost control, and so he ends up becoming what the case is about. But it just felt like, there was this bigger thing at play (there was), and I kind of wanted to know more about it. In that sense, the finale was very satisfying. It nailed all the character stuff, and that's what made this show so great in the first place.
Anyways, I loved the ending itself. The stuff with Rust and Marty in the hospital was powerful. The ending confirmed what I always believed about Rust, and that he was a man that lost all reason to live after his daughter died. That his lack of a purpose in life, had him wandering from one thing to the next, hanging his reason to live on other things (such as this case). And so, I found the resolution for his character to be really impacting, and it didn't feel forced. I also loved how Marty and Rust got resolution on Maggie, and both basically owned up for the situation.
So all in all, I loved half of this episode. Didn't really care for the Errol/case plot stuff, but really loved all the character pay offs.