Well, I remember when the studio sacked Schrader and hired Harlin to do reshoots to this film, they were quite right to do so.
Dominion: Prequel to the Exorcist is simply a bad movie, it's boring, really it is.
It would be nice to think that the studio put aside a psychological masterpiece and that all those who in such big words condemned Harlin's version and praised Schraders, even if no one had ever seen it, would have been right.
But they weren't.
To put it in a nutshell : Schrader has no idea what a horror film should be, and it shows in a big way.
Droll, boring, unintentionally funny in all the wrong places and bad supporting cast.
Save your cash and your nerves, don't see it.