Both now, even with my 2.2 speaker rig I find most rock/metal hard to listen to now. I have been a fan of those genres since the 1980s, but now that I have been able to enjoy really well recorded, and engaging music, it is hard to not notice the difference. I know that there can be and are, better rock/metal recordings, but even with those in my experience, once the songs get into busy passages everything gets congested and edgy and the sense of definition and impact from drums (I am a drummer so I tend to notice) gets really washed out into a wall of sound.
I have no doubt there may be exceptions, but in my years they are certainly the exception and not the norm. Maybe your self-proclaimed bad ears are making things seem better than they are? Maybe not. Anyway, it is just a shame as for about the last 4 years I have essentially stopped listening to those genres period. Maybe in a car I might indulge, but never with headphones. I am going to try again though just to see if I am perhaps being unfair or exaggerating. I have to say, after several years of listening to well done electronic music, I think rock and metal will be hard to enjoy from a sonic standpoint. Good electronic music even when turned up can be so powerful and engaging, none of that wall of sound even when things get busy. But that is to be expected in many ways. It is much easier to control digital samples versus recorded instruments being played by real people and picked up by microphones (the clear weak link).