Love it or hate it, her novels, over and over again could set generations of young minds on fire, which her essays could never do. I think it's fair to say the non-fiction was a lot worse.
Always a good time to remember this fantastic quote:
“There are two novels that can change a bookish fourteen-year old’s life: The Lord of the Rings and Atlas Shrugged. One is a childish fantasy that often engenders a lifelong obsession with its unbelievable heroes, leading to an emotionally stunted, socially crippled adulthood, unable to deal with the real world. The other, of course, involves orcs."