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I am not saying that if the authors claim "water is wet", you need to ask for a second opinion.

Ok I lied, you need to ask for a second opinion.

There are parts that are genuinely riddled with sweeping statements and superfluous information, but to be fair, there are also parts that actually are interesting and are based on psychological studies done on human behaviour and the resulting body language. The problem lies in separating the proverbial wheat from the chaff. Since some claims are questionable, all claims are questionable and it doesn't hurt to educate yourself on claims that seem too neatly packaged to be true. Winnowing and Google go hand in hand.

So, in summary -
- Interesting read if you suspend scientific rigour and logical disbelief at certain points.
- Good book to skim through to get a better grasp on reading your audience or improving your body language but not one to be taken word for word and read through with firm conviction in all the claims made.
- Get a second hand copy for yourself and speed-read the book in a day or two.