Why did it have to be about fate and superbeings and destiny and all this other convoluted matter?
*sighs* And it's because of opinions like this that people tell me I'll never get published because my stories are "too complex".
Fact is, some people like the more complex aspects of the story. We like Cassie being an anomaly, and Tobias being Elfangor's son, and the Ellimist and Crayak playing a sinister game. As is the nature of things, other people disagree, and that's perfectly valid. To each his own, and all that jazz. But just because some people don't like it, doesn't mean it shouldn't be in the book. If you start taking out everything that some readers might not like, you wouldn't have anything left.
Writers need to write what
they want, and what
they think is interesting. If they start wondering "Well, some people might not like the supernatural aspect", and start flitering their ideas to fit the current market, they stiffle their creativity.
K. A. Applegate wrote what she found interesting. Some readers liked it, some didn't. That's just the way things work.