I mostly concur with your sentiment. I have read it my summary is maybe "common sense meets idyllic 1950s TV show".
Maybe I'm conflating manners and superficially "nice" behaviour and a few other things, but I found many pieces of advice borderline cringeworthy.
Then again I do know I am being too honest, but that's mostly a deliberate choice and not lack of empathy. I can refrain if needed.
Added to clarify: I'm German and so some of my (our) attributed directness and terseness is apparently at odds to some American forms of communication, and if you look at the book in this light it makes more sense. Also, I'd still encourage everyone to read it, I just don't buy the awesomeness :)
Then again I do know I am being too honest, but that's mostly a deliberate choice and not lack of empathy. I can refrain if needed.
Added to clarify: I'm German and so some of my (our) attributed directness and terseness is apparently at odds to some American forms of communication, and if you look at the book in this light it makes more sense. Also, I'd still encourage everyone to read it, I just don't buy the awesomeness :)