I just finished the show and I totally get why a sizable chunk of people feel like they didn't get what they wanted out of this season.
Obviously, as up front as Netflix and Flanagan were about what this season was trying to do and the fact that the show itself makes it abundantly clear what kind of story it is, there were going to be built-in expectations based on the first season and mention of the horror genre that this season was never going to fulfill based on its intentions.
Was it sentimental? Yes. But the sentiment was earned based on the character work and the storytelling. There is not a lot of television out right now that invests so much in how it is telling a story from beginning to end and how it interweaves different character traumas and backstories and motivations into the fabric of its themes while using far-out horror/fantasy concepts to underline and extrapolate the thematic. When we get Peter's backstory and realize how it informs how he treats Miles, I mean, damn.
Yeah, it was a slow build. Yeah, not every character hit the mark completely. But most of them really did, episodes 5 and 8 were just outstanding television, and while a bit sappy I do think the finale was a very strong follow-through and denouement for everything that was on this season's mind and heart.
As an adaptation of Henry James, no, it doesn't really capture the essence or vibe of his work at all, but ultimately I am okay with that because I do think it was really impressive how it integrated various story ideas of his into one whole that felt very complete. And it did keep the meter of pace and method of quietly evolving story construct that James was so good at.