50% of all Exorcist films are good!
The ratio is actually fairly decent compared to MOST film franchises with six entries. For example, Terminator only has 2 out of 6 "good" films (the first two, directed by Cameron himself), and Highlander only has 1 out of 6 "Good" films (the very first movie). With Exorcist, the scorecard is:
Exorcist (1973) - Good
Exorcist II (1978) - TRASH
Exorcist III (1990) - Good
Exorcist: The Beginning (2004) - TRASH
Dominion: Prequel to the Exorcist (2005) - Good
Exorcist: Believer (2023) - TRASH
Unfortunately, if David Gordon Green is "in charge" of the next two, it will probably continue the "TRASH" trend. Sounds like the studio is planning to quietly replace him. But I'm not sure how even a really talented director that makes solid films will be able to do a DIRECT followup to Believer, and salvage the direction the franchise is headed. It would be smarter if the next film was a "stand alone" entry like all the other sequels/prequels, and IGNORED the events of "Believer". Unfortunately they seem to be locked in place doing this "Deceiver" sequel.