Some of the more orchestral pieces are nice, raise the tempo of areas etc. But others (the pseudo rock stuff) really does feel completely out of place. Most of all at the moment it seems to cut in in completely inappropriate moments.

Fantasy style rock/metal can be done well. I've been playing the GrimDawn alpha and some of the music in there is just amazing, and really sets the dark atmosphere.

Anyhoo, I'm not going to pass much judgement on what I assume is filler music in the alpha, but I agree that some of it is quite nice.