Basically take every every demonic possession movie trope you have ever seen, and have them delivered by a group of exorcists that look more like mentally ill out-of-work actors and you're half-way there.
The recreations of the scenes are better than average from a production standpoint, but completely unimaginitive from a storytelling perspective. Clichea. Tropes. Jump scares.. But not a single believable story in the bunch.
I usually like Eli Roth's movies, but this is the trashiest sort od trash TV. I expected slightly more from him here.
I guess the only question this series left me asking is "Why bother??"