Although others may debate the book's concept, at the end of the day it is what it says it is - "The Bluffers Guide". It's easily read in an hour or so and written in a conversational style. It's easy to overlook that some of the topics say in a very few words stuff that others have written books on, but nethertheless are immutably true - especially the importance/relevance of your bank manager or accountant.
So although it's light hearted, it does have a serious side. In particular the glossary contains a list of terms and what they actually mean which is both amusing, alarming and true. "Exciting opportunity" - long shot, "Long term prospects" - the boss's dream, "Slow growth" - dead stop and in reverse, "Considerable boost" - lucky break, etc.
There's also a phrase which is most compelling, "The bluffer will wish to conform to the idea held by others of what a reliable business person in their chosen field looks like". The tragedy is that this way of thinking holds so many businesses back from achieving their full potential.
For the money, it's a short guide that is potentially more useful than many of the seemingly erudite works one sees.