This is a good read, and scary in that it projects current issues into a very possible future.  The protagonist's detatchement written as a retrospective, gives a degree of seperation from the events, so it's not as engaging as it could be.  For an even better, more viscereal and IMO more engaging treatment of this, I highly recommend Kratman's "Caliphate".  THAT book is better written and is a very scary and brutal treatment of the theme.  I just HOPE that both of these book's projection into the near future never come to pass..... but they could.  That's the scary part.