Dominion suffers, badly, from unfinished cgi shots that make Harlin's version look like the cutting edge of SFX. The music score is choppy (collated from various sources) and the exorcism is as ridiculous as it was in Exorcist: The Beginning. The fact that Dominion is, at times, a riveting and fascinating film, makes one feel sad that the end product has come to this. After all the hype about the "intelligent" version - it's not that intelligent, or deep, or profound. You get the niggling feeling that Schrader wasn't the man for the job and that the studio might have been right to replace him and reshoot the entire movie.
However, the film isn't a total disaster - Stellan Skarsgard makes a brilliant Merrin (again) and Gabriel Mann is superb as Father Francis. There is some genuinely impressive stuff in this film (the pre-credit Nazi sequence immediately springs to mind), but it is a shame that it's the actual horror/supernatural elements that let it all down. They feel embarrassing to watch, because they are so hokey compared to the much more interesting character studies taking place.
Somewhere - between Harlin and Schrader's versions - there's a bloody decent movie. Harlin's is trashy and OTT, but it allows you to suspend disbelief and enjoy the mess, where as Schraders version is very serious and fudges the horror. So, who's the winner? Renny Harlin. And I never thought that I'd be saying that at the end of the day.