This book is an excellent reference work for the serious amateur of Burgundy. The focus is very much on the top estates and domains of the Côte d'Or (Côte de Nuits & Côte de Beaune, as opposed to the Maconnais, Beaujolais, or Chablis -- all technically part of Burgundy in the French appellation system); while well organized and refreshingly jargon-free, debutants looking to ease themselves in to the most complicated wine region in the world might want to look elsewhere.
After living in Burgundy for six months, visiting almost 100 domains, and looking at just about every reviewer's notes, I trust Coates above anyone when it comes to Burgundy. He is a believer in terroir, and cares deeply about balance and finesse; those whose tastes track Parker's, who care most about extract, color, and power are probably looking at the wrong book. (They're looking in the wrong region, too -- and at the wrong varietal for that matter.)
This book is an absolutely essential part of every oenophile's library. Why only 4 stars? The reviews are somewhat out of date -- a problem for anyone with a relatively new wine drinking/collecting habit (latest vintage reviewed is 1996, I believe, and that one only briefly). Also, the tasting notes are not as comprehensive as one might wish -- Coates sometimes limits himself to notes from a single vertical tasting in a given vigneron's cellar.