Genuine question: What do you find appealing about it? I've always found the writing impenetrable and the philosophy unappealing.
The writing, I agree, is pretty bad, and she has an odd obsession with trains and motors. I can just about understand the "motor" part because it allows some not very good "motor of the world" metaphors.
The appealing part is the depiction of the evil characters as endlessly dependant on the hero characters, and their view of them as an inexhaustible source of resources for whatever they want, and the rejection of this.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.