I don't know if I could define, or pinpoint, what makes one good and the other annoying. I don't really care for this style, but when it is skilled, I can listen to it. The best I've heard is from John Wall, Alterstill and Fractuur in particular. It's what I consider spazztic, which is one reason my brain doesn't get along that well with this style, but he also did it in a way that I can find myself trying to hear his sources. I can focus into the mess. On one of those releases, he lists some of the sources, and it was fun to try to find them. It's more of a listening exercise and a matter of admiration for the skill than something I enjoy or get satisfaction from hearing. So maybe I think of this area of experimentalism as more about technique and the technical than about the result, and that doesn't go a long way for my listening needs.
John Wall - Alterstill 1995
John Wall - Fractuur 1997
Nurse with Wound - The Sylvie And Babs Hi-Fi Companion 1985
P16.D4 - Distruct 1984
Mixed Band Philanthropist - The Impossible Humane 1987
Bladder Flask - One Day I Was So Sad 1981
I'm drawing a blank right now, but there are at least a couple LAFMS releases I'd throw in here