I'm as anti Japafag as they come, but real talk: Silent Hill I-IV have the best soundtracks in gaming. They are all just ridiculous. This guy (girl?) Akira Yamaoka is amazing. Best musician working in games by far.
edit:
I also find most Blizzard soundtracks amazing, especially Diablo, love the Deus Ex soundtrack, love the Xenogears soundtrack (japafagggggg), all Valve music, Myth soundtrack, recently Mass Effect soundtrack is ridiculous and has one of the best game themes I've ever heard.
But Silent Hill is king. Consistently amazing.