These are some of the main critiques from this website:
"The Purpose-Driven® Life may contain some helpful, Biblical truths, but it cannot be trusted to lead a believer on a spiritual journey that is completely true and faithful to the Word and will of God. Why? Because Warren often misinterprets Scripture to his own advantage, conjoins untrustworthy, humanistic psychological principles with Biblical truths, minimizes the importance of sound doctrine, deems holiness and biblical separation as less important than love and unity, refers to enemies of the faith as positive contributors to one's spiritual journey and promotes his entire
Purpose-Driven® program."
And this is what I had a problem with the most, that I could not keep straight what "my purpose" is supposed to be, with so many different references (i.e. "what God wants most is......").
"The purpose of Warren's book is to answer the age-old question: "What on earth am I here for?" According to Warren, believers have been placed on the earth to fulfill five purposes. He writes, " [God] has clearly revealed his five purposes for our lives through the Bible" (p. 20). These purposes, according to Warren, are to bring enjoyment to God (p. 63), to learn to love others (P. 125), to become like Jesus Christ (p. 17 1), to serve God (p. 23 1) and to fulfill one's mission (p. 28 1). Yet it can be argued that Warren's thesis itselfthat these are the believer's five purposes for existence as "clearly revealed" in the Bibleis not entirely consistent with the teaching of Scripture. The Bible only declares one purpose for mankind's existence: to glorify God. This is man's purpose. From the beginning of a believer's spiritual life in Christ until he is with Jesus Christ forevermore, he is to live "to the praise of [Christ's] glory" (Eph. 1:6, 12, 14). Throughout all eternity God's children will glorify Him (Rev. 4:11). Because the believer is "bought with a price," he is commanded to "glorify God in [his] body, and in [his] spirit" (1Cor. 6:19-20). This is man's sole purpose and reason for existence."
These quotes were from just one of many different articles critiquing this book.
http://www.fundamentalbiblechurch.org/Foundation/fbcAnalysis.htm