Author Brant Hansen makes the case that as followers of Jesus Christ we have no right to get angry. In part because of this, we can and should be unoffenable people. This, in turn, makes life better and less complicated. Hansen's argument has more depth than what I've described here, but this is the gist of it. He even tackles the ubiquitous Christian idea of "righteous anger." The best part of this book is that Hansen supports his thesis with a good amount of scripture from various parts of the Bible.
I appreciate the author's belief that we, as Christians, should be humble people. Since God has saved us, people who don't deserve saving, we have no reason to be prideful. On page 192 of Unoffendable Hansen writes, "At the beginning of this book, we talked about the crazy idea that we are not entitled to anger, and how taking this idea seriously actually opens up new dimensions of rest, grace, and simplicity in our lives. We are, above all, embracing a radical humility."
As for negatives, my only real criticism is that the author stresses the grace of God almost to the complete exclusion of sanctification. While God saves us and sustains us through His grace, He also has an expectation that we will grow in holiness. Hansen basically ignores this topic. I find this fascinating because it seems to me that growing in unoffendability (is that a word?) is part of growing in sanctification.
Two other aspects of this book annoyed me a bit, but this has to do with personal preference more than anything substantial. First, the author writes in a very casual, conversational style. This is fine, but takes some getting used to. Second, although Hansen quotes various versions of the Bible, he leans heavily on the New Century Version (NCV). This version has a low reading level, and thus reads in a choppy manner.
If you can deal with a casual writing style and don't mind the NCV, then I recommend this book to you. The author address a topic that we all need to ponder.