Mmhm...in my experience, a game that has a good soundtrack - when OST is usually judged to be the least important factor of a game - excels in everything else. Or, at least, nearly everything else. A few recent games with spectacular soundtrack have had awful graphics, but graphics are the least important element of a game to me, so. xD
Hmmm...JRPG soundtracks, mostly. NieR, Xenoblade Chronicles, the Atelier series, etc. Anything orchestral...with a choir. I go to pieces whenever a choir is involved, aha.