Not that it’s surprising that any writer or reader with even reasonable taste would reject Ayn Rand as horrible writing, but still, Flannery O’Connor in 1960:
I hope you don’t have friends who recommend Ayn Rand to you. The fiction of Ayn Rand is as low as you can get re fiction. I hope you picked it up off the floor of the subway and threw it in the nearest garbage pail. She makes Mickey Spillane look like Dostoevsky.
On the other hand, Rand actually liked Spillane so, well, whatever.