I've turned the music off for Dead Space before, but not because I thought it was bad or anything (in fact, I quite like the scores in the Dead Space games). I just wanted to see if having no music would make the game any scarier, since a lot of the time I'll fight a group of necromorphs and kill off all but one of them, and the action music will still be going on, thus alerting me to its presence and curtailing any scares that could have been had from having that last surviving necro jump at me out of nowhere. It actually worked to an extent, but I still like to leave the music on most of the time because it's so good.