The book is a very solid outline of basic actions and underlying spiritaul principles that can be used in the recovery from alcoholism. As it says in the book, this is ONE method, not THE method. For those who this does not work, perhaps they need to go elsewhere. For those who find success somewhere else, congratulations.
While there has been a general desire not to mess with the wording of the 1st half of the book, it may do this book well to undergo editing. The language used is sometimes out of date (i.e. - "the gay nightspots" has a very different meaning today than in 1939). The sentence structure is complex and the paragraphs are long. This affects the flow and causes the reader to lumber through numerous passaages.
If AA does not want to edit the first half of the book (which they refer to as the "main text"), perhaps they could publish a companion "modern day" Big Book - same concepts but with contempary writing.
Still, the book's content is brilliant: doctors, psychologists, spritiual leaders, law enforcement, etc. have all witnessed the results and thus supported the book's central themes. That tells the reader that there must be some validity here.
In the second half of the book are personal stories of recovery from alcoholism. Some of these are very powerful: "Fear of Fear", "Doctor, Alcoholic, Addict", "Freedom From Bondage". Other stories are out of date (the 3rd edition was published in 1976). I understand that a 4th edition is being prepared that will include more stories from gays, blacks, women, and people from outside the USA. That should help the readability of this book a lot.
Most AAs read read this book in the company of other recovering people, which probably helps clarify the confusing language. Still, freshening up the writing would make the content more accessible to a larger circle of people.