Well, azrael's a friend of mine so of course I'll defend his work. But I have to say that I think the piece's more laid back feel is a good thing, especially when playing for extended periods of time. Some of van's work is really nice, especially the theme piece. But all the metal in the game really does my head in over time. And I think when playing the game, the quiet sections really won't be as noticeable, and will even be a welcome respite for all but the most dedicated metalheads.
Hertzilla's right, this isn't a battlescape track. But does everything have to be metal? I have to turn the music off every time I install a new version, which is a shame because the theme as the game is loading is really nice.