Well my musical taste doesn't really have alot to do with games. I like VNV Nation, but also listen to a large variety of stuff (duke ellington, the chordettes, passion pit, aphex twins, etc..) have I looked up a song that I liked from a game? yes, thus why I now like cage the elephant, so to an extent, games help promote music, music i've discovered due to games: the ink spots (fallout 1) cage the elephant (borderlands) passion pit (little big planet 2) i'm sure there are others, are they all considered the greatest of music? no.
If anything, maybe you could defend some of the music by pointing out that some bands (cage the elephant especially) wouldn't be as widespread without the tie in to gamers...
and if I'm making no sense and rambling, I apologize, just pulled 2 8 hour shifts at 2 different jobs, so coherency isn't at the top of my list.
or just be a total bint and point to audiosurf, and say "there ya go a game with good music!"