I just would like to share about the criticisms, it could be edifying:
"In spite of its widespread use and endorsement, including Reverend Billy Graham calling it a classic devotional[citation needed], some in the Christian community have been critical of the book for various reasons. Jimmy Swaggart and John MacArthur criticized the book as "pop gospel." Others have expressed concern that Warren's methods do not adequately account for individuality, providing a one-size-fits all approach to spirituality. Many Christians have expressed concerns with The Purpose Driven Life and the teachings of Rick Warren for their 'Walmart-esque' business models, their humanistic worldview, Eastern philosophy and Mystical or New Age influences such as walking the prayer Labyrinth, Breath Prayers, Mantras, Chants, Hula Praise Dancing, Contemplative Repetitive Prayers and other practices considered by many Christians to be un-Christian and/or even of the occult, entering the church.
Another common complaint is that Warren fails to present the evangelical Christian gospel accurately--failing to accurately represent the nature of sin, repentance and hell and the blood sacrifice of God's son Jesus as the means to be forgiven by God for sins and allow man to have a relationship with God. Critics also frequently complain that The Purpose Driven Life contains many examples of inaccurate exegesis, and that it makes frequent use of loose and inaccurate paraphrases, as opposed to more faithful translations. Critics likewise contend that when citing Scripture, Warren jumps from one Bible version to another, cherry-picking whichever paraphrase or translation supports whatever point he attempts to convey. Yet another common complaint pertains to Warren's statement that "Whenever God wanted to prepare someone for his purposes, he took forty days""--a claim which critics affirm to be both overly broad and contradicted by Scripture.
Secular criticism can also be found. For example, a series of Business Week essays claim that the business models of the megachurches that follow Rick Warren's "purpose driven" model are based in real estate, not saving souls. Theologian Robert M. Price has written a critique of the book called "The Reason-Driven Life".
Atheist philosopher Daniel Dennett said he admired the book's stated goal of bringing purpose to the lives of millions; however, he criticized the author's implicit acceptance of intelligent design, his rejection of rational criticism of religion, and his assertion that morality derives exclusively from religion."
Source: Wikipedia