I've always wondered what exactly it is about dimarzios that I dislike so much - i've traditionally been a duncan guy as well, though I like emgs, and the last few years i've really loved Wagner and Tone Nerd and a few others
Whatever "it" is, it's not in all dimarzios, but the main popular pickups have that weird upper mid artifact thing is always there. I don't know of any material/construction difference between dimarzio and other brands, so I really have no idea what this thing is.
I should bug @scottosan about this, he would know.
Scott, what in god's name is the cause of that "signature dimarzio sound" that people either love or hate? It's like a brittle transient sound that's really apparent in palm muted notes on a super distortion. (thought it appears in other pickups they make to varying degrees)
Slayer's old stuff is actually a good example tone of what the haters are talking about - instead of the palm mute "booming" or "blooming" its like a smaller, more constrained "tick tick" or "scratch scratch" sound. You can hear it really well in a couple of other "classic" tones as well, like the early Kiss stuff.
When you compare it to like the famous JB or Mighty Mite tones of the same time period, it's not there. What the heck IS going on?