I thought the movie was pretty decent, but it was really Dementus that stole the show. I agree that the pacing was off. I was never bored but it did feel more monotonous or just more melancholy and somber than previous films, almost like a dieselpunk epic drama. I also noticed that the music was somewhat lame. ATJ did a great job, though, acting-wise. As did most of them.
I do get it trying to be more of a drama instead of a full-blown action thrill ride, its just that pacing didn't do it any favors. And yeah the music...tbh I barely noticed ANY music. I think the lack of score in some parts contributed to the off pacing and made it drag more.