The Percy Jackson series was my life in middle school! It's been a couple years, but I still think (from an adult POV) the characters are developed well, the plot is compelling and exciting, and it's a great introduction to Greek mythology.

As an early teenager, I appreciated the well-rounded cast of female characters. They're realistically portrayed and have dimension, which is hard sometimes in YA novels.

I definitely recommend it (even to adults who want something fun), just don't watch the movies.