In a 1989 interview, Robert Holdstock described American science fiction magazines of the mid-sixties as
"where ideas were combined with illiteracy"
I wdn't put it that strongly, but I think Holdstock was picking up on something I noticed when trying to get a handle on the key difference between the New Wave of the late sixties and what came before it: writers of the Gernsback and Campbell eras, whose readers judged science fiction on whether a work had a new or interesting idea and not the eloquence of the prose. Some fans even made it a point of honor to disparage writers who wrote well, like Bradbury.
Anyway, thought it was a great quote. Enjoy!