I enjoyed the ending. I wasn't expecting some huge twist (obviously after the reveal in episode 7), but there was a lot of build up of a deep conspiracy/cover up and in the end we only get the psycho redneck.
I know they address this in the show when Rust and Marty are talking about the others still out there and they got the guy they were after, but you can't help but want to find out more about this cult and the members (especially the ones in the tape). Also what was all the stuff regarding Marty's daughter? Why was she focused on? especially with the dolls lined up like how they were in the taped ritual.
With that said, Errol's house and Carcosa were extremely creepy. The dolls, piles of childrens clothes, drawings on wall, dead dad on bed with a sewn mouth.. disturbing shit.
All in all, one of the best shows I've seen, and a very re-watchable one too. Season 2 has a lot to live up to, they better pick some damn good actors.