I think that if they were going to end with Son of Jingles hearing ghost stories, they should have started with that so it wasn't as much...I found it irritating, frankly, to drop this guy in and tell the end of the story in flashbacks, cutting the tension they were building and obliterating a lot of the payoffs by sucking up screentime for this new character's journey. I kept waiting for him to be something, and it didn't happen. It couldn't have, in such a limited time.
But, I probably wouldn't have been as into the season had they built it around him, because I was all-in on a fun love letter to 1980s slasher movies. For me, that was more than enough to provide entertainment even if characters didn't have a lot of depth. Heck, their lack of depth was itself part of the homage.
So, the finale didn't really do it for me. They abandoned the 80s premise without giving me something else to get excited about, since pretty much every villain/conflict was dealt with in a matter of seconds. I did love the rest of the season, though. I'm curious how it would have played out if they didn't cut down the number of episodes.
On a positive note, it is kind of interesting that this random collection of ghosts can thwart Satan's efforts, just using the power of community.