I've given away discs in the past that just sounded horrible on my system, unlistenable (Who's Next on CD, unreal how bad it sounded). My system is revealing, Martin Logan Quest Z speakers that rock just fine; for the most part rock is easy to listen to although I do tend to listen to rock louder than I would classical or blues. I do find myself listening more frequently to music that's better recorded (e.g. Steve Winwood, Frank Zappa etc) but I chalk that up to good taste and common sense more than anything. To summarize, I sure wouldn't want to find myself with a rig that really only played one gendre of music well, that would get boring fast.
Rock and Roll Snobbery
Can anyone explain why otherwise high end, musical systems might "not be good for rock and roll?" Or why a system that sounds fine for pop and rock might not do justice to classical and jazz? It seems to me that a great system should sound good with all types of music and that a good for classical system might be deficient in bass which is not exactly state of the art.