I've read many reviews here that say the book is unfunny. That it is sexist, and that it is boring. Well, if you've lived in France for more than a couple of months, you will find pretty much everything the man has to say about the french not only hilarious, but completely true. Office life is boring, personal relationships frustrating and dog excrement real (although this is being tackled by the Mairie nowadays).
So if you haven't been to Paris to live and not to travel (most of the subtleties don't show until you actually have to rent an flat, have a boss and work colleagues, get ill and have to go to a pharmacy, or endure a strike, which usually takes more than a couple of days) you will most definitely not fully understand the frustration encapsulated in the book, like a Californian watching a Dylan Moran rant about London youths.
If you already are an expat, or plan on becoming one, this book will be one of the most valuable items you'll have in your bag.