This will be brief.
I have no idea what to make of this book.
It is not the book was bad, it just wasn't ... great, or consistently funny. Nor did it feel like an honest commentary on, well..., anything - apart from the incident with the underwear thief, maybe. (No, I won't elaborate.)
There seems to be a lack of direction in this book - some parts are rants about former co-stars or anything else really, some parts are memoirs, some parts aim at explaining Shatner's/Bill's characters (yes, there are two, at least) - and I can only guess that some of the uncertainty of what this book was about and where the stories were going stemmed from the co-authorship with Chris Regan.