I just got the book today and am a few chapters in (I've covered the ones dealing with music and dancing). So far, I think it's excellent. Although many would certainly consider the Saint overly strict, the spirit and intent with which he is writing is self-evident, and I see no reason for readers to be surprised, scandalized, or prone to mockery on account of anything he says. Furthermore, the more severe parts of the book are not the words of St. Nicodemos himself, but come in the form of quotes from the early Fathers, primarily St. John Chrysostom and the Cappadocians.
That St. Nicodemos calls his readers to what would seem for many to be an unattainable ideal should not put people off. Christ did the same: "Be ye therefore perfect, even as your Father which is in heaven is perfect" (Matt. 5:48).