Here's why:
* Age range: It's written for children ages 8-12, which is the typical middle grade reading range.
* Humor: The book is full of relatable and humorous situations that appeal to this age group.
* Themes: It deals with themes like friendship, family relationships, and navigating social situations, all relevant to middle school experiences.
* Writing style: The story is told from Greg Heffley's perspective, using a diary format, which is engaging for young readers.
While it contains some elements of humor that adults might enjoy, the book is primarily aimed at children in the middle grade age range.