This review doesn't need to be lengthy: Look, there are lots of books on the WTO. If you want the accurate summary to understand this issue simply, this is it.
The book does have a lot of useful information on how the WTO runs and how it is focussed on the needs of corporations, most of which reside in the most developed capitalist countries, and which seek a set of global rules that allows them greater freedom of movement to invest and exploit (wow, I already hear the neo-cons whining because I used the 'E' word.) It also shows that the balance between global capital and the nation state has shifted, though this does not have the dire anti-democratic consequences claimed herein. That would be the liberal assumption that the nation state 'represents the people' and that that is a good thing.
At the same time as some people claim that the WTO is killing the nation state, this book makes it clear that the WTO is a body run by and through nation states. Corporations cannot directly intervene, but must have their concerns addressed through nation state mediators.
The book also does a good job of exposing the total lack of accountability of the WTO, as well as one of its unique features: unlike previous UN organizations, the WTO has disciplinary powers which it can use to enforce its rulings, something no 'humanitarian' part of the UN ever had.
The abscence of any kind of class analysis hinders this book theoretically and means that some possibly interesting questions do not get answered.
This book is better read alongside some other texts, which, even with their failings, fill in some of blanks here, such as Negri and Hardt's Empire.
Overall, a pretty useful and utilitarian overview of the WTO.