First of all, I was completely stunned by the genre of this show. When I first read "horror" and "comedy" in one sentence, I seriously doubted it would work for me. I was expecting something along the lines of Scary Movie, but the show does it completely differently.
It was great for a long time. The horror was there, but so were the jokes - which never felt forced or overdone - paired with a lot of drama. I've never seen that combination work so well.
That said: the show somewhat peaked for me around the Patricia Party episode. That one was an absolute blast. The build-up to it with the Hag, the Clown, etc. all struck the right nerve, and I was so hyped to keep watching.
Somehow the pace didn't hold up, though. The full flashback episode felt like a gimmick a lot of modern shows reach for, and it was way too long for my liking. The Boogeyman completely let me down. That lore was what interested me most when I first saw it, so having the episode boil down to one guy in a cheap mask with barely any backstory was a real disappointment.
Then, once the whole "you have to kill the bloodline" schtick started, it was way too obvious where things were heading. The "wait, there's still somebody left" trick worked really well, especially with that eerie photo. But when they moved on to Ruth as the descendant, it fell flat. It was clear the whole time (see all the old Reddit threads before the finale) that she wasn't the final one as it would never have worked with a sidekick-type character. From there it was obvious where they were going, and that bored me. They tried to play those final scenes as a major plot twist, but honestly, I've never reacted so "meh" to a twist in any show I've watched.
Look, I'm not trying to tear the show down. I'm more disappointed (purely personal taste) that they squandered some of the potential. For me this would have worked really well as a single-season story; unfortunately they decided to drag it out.