This is not just a cold listing of all regions, estates and wines like most wine guides. A significant section of the book is dedicated to explaining the history of Greek wine, the plethora of indigenous vine varieties, production methods, etc. It's really fantastic education, written in a very novel-like readable manner.
The guide part is certainly complete too - listing all the regions and most producers with lots of information for each.
However, there are two major things missing.
1. Price information, or just value for money information. Even if it was just in two or three categories, like less than 5 Euro / Pounds, between 5 and 15, and more than 15. This is always a good indicator to see if your local importer is ripping you off, and is also a way to narrow one's scope a bit so that it lies within one's budget.
2. Ratings. There are no ratings given at all. The author says he wants us to discover the wines for ourselves, etc. Now I agree with that to a large degree. To score wines on a scale from 50 to 100 just leads people to buy a 91 point wine and ignore an 89 point wine, and most of us, even if experienced wine drinkers, could not tell the difference between them anyway. However, I do not have the time, money, and local choices in selection to try 1000 wines and make up my own mind. I rely on the author to give me some guidance. Yes, in his reviews of each estate he does make comments such as "simple", or "excellent", or "surprising" etc, but I would have loved some overall indication of quality - even if just on a scale of one to three stars like the French Guide Hachette does.
Overall, very good, but would have liked to see more pricing and quality information.