I seem to be going out of my way to find things I dislike about Dies Irae for some reason, but thus far the action is about the only part of Dies Irae I've liked (admittedly it's amazing at that, though).
Maybe the music, too, but I don't tend to make conscious note of the music in VNs while I play.
Then again, it IS a chuunige, so maybe that was the point.
My opinions will probably turn by the time I'm done with Rea.
Edit: Finished Rea. Started off pretty exciting, but fell flat just about as quickly.