This book is far from a definitive study on this ancient subject about which so much has already been written. It is merely an incomplete selection of tentative, still-developing thoughts, from a practisioner's perspective, on the guerrilla wars we are currently fighting. I hope that other practisioners and students will find in it much to agree and to disagree with, and that it will thereby form part of a continuing critical debate.
I'm glad Kilcullen qualified his work as such. Its two major flaws are as follows:

1.) Those of you who hang around the SWJ community and Tom Ricks' blog will have likely read much of the subject matter before.

2.) It's too ambitious for a practitioner's guide to COIN, but not comprehensive enough for an all-encompassing work. I think he might have done best saving his last chapter for another book.