I suspect that some older kids into fantasy would like this book. Many children, particularly boys, will enjoy the character portraits and powers. They remind me of trading cards.
Having taught for 31 years in grades 2-6, I can assure you that few kids in the 2nd and 3rd grades possess the ability to read and comprehend this story. The vocabulary and sometimes violent storyline are much more appropriate for older elementary students.
There are some excellent messages and themes, such as perseverance and believing in yourself. This is the first book in a series. I would recommend that adults preview the book first. While some kids would enjoy the good vs. evil theme, I thought the story was okay. I won't be buying any of the other books in the series.