Visually this book is very striking - with an awful lot of fascinating and attractive pictures of the Vietnamese landscape, the bustling cities and of course of the food. The recipes themselves are well laid-out, very pleasant and so far as I can tell (though I'm really not any kind of expert) very authentic. The overall organisation of the book is also pleasingly logical with recipes ordered according to region. The recipes are all furthermore put into some kind of cultural context via an accessible introductory passage to each region.
These passages, however accessible, are not brief, nor are they really objective, informative accounts of each region's culture. Collectively, they are instead, essentially, a travel log written in rambling prose, of which a large part is an account of various family reunions (but with the occasional interesting fact about Vietnam's food or culture thrown in). Given that with most contemporary food writing there will invariably be some sort of autobiographical or narrative preamble before each recipe section, they are usually easy to overlook or even enjoy out of idle curiosity. In this book however, they are pretty gratuitous. Upon opening this book to a random page, you are about as likely to encounter a non-food-related photograph (however pretty) or an excessively detailed description of a day of travelling and social interaction as you are one of the recipes.
I appreciate that many people enjoy this kind of travel writing and that for existing fans of Luke Nguyen a lot of this autobiographical detail would be fascinating. My expectation on buying this book was however, that it would primarily be a recipe book of generic interest for anyone wanting a concise but detailed account of Vietnam's food. As a consequence of all its unnecessary padding and dressing-up the book is also totally unnecessarily enormous considering the number of recipes between the covers. As other reviewers have already said, the content of the recipes deserves 5 stars. However, since, contrary to expectation, this only accounts for (probably) considerably under three fifths of the book, it gets 3.