Are systems genre dependent?

I know a lot of people believe if a system is well balanced, it should sound superb in all genres of music (Rock, Classical, Folk etc.). To a large extent, that is true.  But I also think that systems can be skewed in favor of particular styles of music.  I really don’t believe my system, which is very well set up for classical, can fully do justice to most kinds of rock.  And, conversely, I’ve heard systems that really rock but don’t sound really top notch in classical.  Now, I’m not saying that a balanced system will sound bad or even mediocre in any kind of music.  Just, that for ultimate performance  systems do vary in presentation.
What do you think?