I find motivational stories, and many self-help books, condescending. The moral is usually simplistic, so if the story were really supposed to teach me some answer I hadn't thought of, I would have to be an idiot. And if I did know the moral, then why are you telling me this story? Plus, it puts the teller of the story in a superior, "I know more than you, and I know more about you than you know about yourself" position, which I really hate.
I also find these stories underestimate the amount of effort needed to deal with depression and the like, and the lack of inner resources I might have to confront them. This shows a rather irritating lack of understanding. Also, I usually don't recognize my situation in these stories, so I feel like a box is being imposed on me by a storyteller who doesn't care enough to try to empathize with my situation and see it from my perspective. (And NTs say WE'RE the ones who lack empathy...)
Lastly, I dislike motivational stories because I find anything that oversimplifies the complexity of human nature and emotions to be really freaking irritating!
Bee, I like your point too. I hadn't thought of it before, but it makes a lot of sense. 