Are the similarities between Harry Potter and Percy Jackson too much to pass off as coincidence?

A lot of books can be compared to those two books. It's because it's kind of a popular thing. The writers are both unique in their stories. And like the first person said, it makes people mad. In fact, this question kind of peeves me. They are both their own stories and not alike in the true story. -.- I have an urge to rawr at you. I'll restrain myself.....this time.