"McTighe's novel carries messages about the dangers of copycatting, gossip, and jealousy while offering a satisfying lesson on humility that will resonate with readers. . . McTighe offers a preteen voice in P. J. that is honest and true."
— Booklist

"Author Carolyn McTighe clearly has insight into the world of nine-year-old girls; she is attuned to how girls can behave towards each other, and how young tweens' emotions, including anger and insecurity, are considerably heightened. The note-writing, the search for a new best friend, and her dramatic declaration that she is "never going to apologize" make PJ's distress believable. Although she doesn't have great depth, PJ is a character who, even at her worst moment, is relatable and, more importantly, likeable. . . McTighe lightens the story with her humorous, honest storytelling. PJ's views and commentary on her family, friends, and teachers is amusing, and her training attempts, including a disgusting drink concoction recommended by her brother, add comic relief. Although the title seems to imply a more dramatic novel, the story's lighthearted elements and universal situation create a nice balance in this book for girls just like PJ. . . With its strong message about friendship and learning what's truly important, How to Ruin Your Life is a great middle-grade book for girls."
— Foreword Magazine

"McTighe tells this tale with a wicked sense of humor and employs the device of lists to convey important character details. . . I could see using this book as a read aloud in class to discuss friendship and its responsibilities, and ethics."
— Puget Sound Council for Reviewing Children's Media

"(The characters) come across as real fourth graders, and the story includes some humor. All in all, this is a fast read and a pleasant running-related story."
— School Library Journal