From reading a few excerpts only, I am reminded of a lot of popular science writing, which too often adopts a condescending casual tone full of flimsy, inaccurate metaphors and chatty asides, and which too often omits simple statements of the details of the subject at hand (often less complex than the verbiage used for the adulterated version).
The writing becomes so far removed from the subject, that while those already familiar with it will be able to guess what the author was getting at, those who are not will remain in the dark, leading to a zero increase in the reader's knowledge in each case. Despite being in the former category with respect to basic calculus, I can't help but feel a sense of umbrage on behalf of the latter.