Reading this book was somewhat like going on a long train journey and sitting by the window; at first you enjoy the picturesque views of the countryside, but as time goes on you just sit there wishing it was over. In many ways this book's strength is also its weakness: Chesterton's style of writing, and the particular way in which he builds an argument.
To put it simply, Chesterton's command of the English language is marvellous, and at times I got blissfully lost among his words, much like a man gets lost in the forest and forgets himself, lost in a seemingly eternal moment of synergy with the world that surrounds him. However, that same man must be careful to leave the woods before it gets dark, or else all is lost, and this is precisely Chesterton's vice: too often he excessively adorns a point he's trying to make, causing the reader to lose sight of the main thesis of the essay.
It must be said, however, that the book in particular (The Three Apologies) is three books in one, and not all of them suffer to the same degree from the aforementioned vice. The Everlasting Man was absolutely delightful to read, and Heretics was engaging for the most part, too. It is mainly Orthodoxy that felt almost like a chore to get through.
If I had to describe Chesterton's writing in one words, I'd say 'unexpected'. He is a master at combining nouns and adjectives that one would not normally associate, thereby greatly enriching the text. It is almost like poetry at times, for these combinations do not fail to produce vivid images in one's head that definitely drive his point home.
The content of the book was also extremely surprising. If the truth be told, this is the first Chesterton book that I read. His aura of a great Catholic writer precedes him, and since he is an Englishman, I would have thought that he would dedicate significant portions of the book to analyzing Protestantism. Yet he doesn't. He doesn't, but what he does do is analyze paganism. This seemingly useless enterprise (for paganism is long dead) actually bears tremendous intellectual fruit, for by analyzing paganism he enlightens the reader as to the radical break with the rest of society that Christianity signified, thereby showcasing its uniqueness. Furthermore, he offers some really thought-provoking ruminations about the theory of evolution, especially regarding the 'development' of human conscience.
All in all, this is a book I'd recommend to Catholics looking for an intellectual challenge. Much can be learned from this book, but you have to work for it. It is not easy to read.