Overall, I'd grade "Unfinished" as a decent read. As with anything in life, it all depends on what you're looking for. As such I think it's only fair and appropriate that I try to approach this review from a multi-faceted standpoint, looking at
1: how it rates as an academic read, and
2: how it would rate from the average give-me-what-I-need-to-know-and-inspire-me sort of person.
Written by the President of World Vision (one of the largest international faith-based nonprofits), Richard Stearns has the experience and the stories to reinforce the central theme of the book - that God created you for a purpose, and whatever that purpose is, it is accomplished through action. Although I have never been much of a "purpose driven life" type reader of religious/spiritual material, Rich's interweaving of a large amount and variety of real life stories - coupled with his easy-to-read, easy-flowing style of writing - made for an unexpectedly pleasing experience. As the former CEO of Parker Brothers Games and Lennox, and the current leader of a 60,000+ organization with an international scope, his background of getting to the point and inspiring action, definitely influenced his approach in this book. The chapters are short, themed and replete with metaphors and stories which help encourage the average person and convince them that their life has a special purpose, that God cooperates with us (or perhaps we cooperate with God) to attain that purpose, and if we are willing to take that "walk of faith", our purpose will have a profound, positive impact on the world. As such, I think it would be hard for anyone, barring the hard-core cynic, from leaving this read without feeling somewhat empowered to positive action.
With that said, it is definitely not a seminary-level type read... and that's okay. Not only is the author not a religious leader, but neither is the targeted audience. Although the book does contain some biblical references, and light philosophy/theology concepts, it - perhaps - doesn't go into as much depth as I was hoping for, but rather relies on more experiential analysis. As such, I think it can provide a more relate-able experience for the average person, than a more advanced read might.
What I ultimately like about this book, is that it does a decent job of showing that faith, when just a set of beliefs without action... is stale... but then also inspires you to action.
Overall, I'd probably give it a 3.812342 out of 5, but since Goodreads only accepts whole numbers... I'll give it 4 :)