I just got my book (and the vinyl box!) in the mail. Sorry to hear you're not liking it TAC, but I think I'm going to enjoy it for all the reasons you dislike it. For one thing, I was hoping that this book would spend minimal time on Maiden. I've heard the Maiden stories and, as long as the band is still active*, there's only so much Bruce is going to say in a book about them. Besides, I wanted to learn more about his solo career and his outside endeavors. The promotion of this book led me to believe that this would give Maiden fans insight into how much more there is to Bruce than Maiden, which is kind of his thing anyway. Every time Bruce is on a major news network (CNN/BBC/etc) it's something to the effect of "you probably know him from Iron Maiden but did you know he is ALSO a pilot and entrepreneur?"
As for the family stuff, I'm probably in the minority here but the stuff in musician autobiographies about their upbringing and family life always bores me. I get the appeal, I really do, but it does nothing for me. So I don't mind that stuff being absent.
I did get the impression from skimming the thing that there's a lot of rambling though. We'll see how that goes. Frank Zappa's book is like that too but, unlike Bruce, he used a ghost writer so Bruce's book is likely worse in that aspect. He also wrote most of it by hand in a bar, which is cool, but I'm expecting something extremely disorganized. Not necessarily a bad thing though.
*The big problem with a lot of these rock bios is there's only so much you can say about the band while the band is still active. He probably doesn't want to give out more of a scoop on Maiden than the rest of the guys are comfortable with and he probably isn't going to candidly talk about his relationship with Steve as long as they're still bandmates. The band's management probably plays a part in that as well. It would've been nice for Bruce to wait until Maiden call it quits, but I get the feeling the cancer scare motivated him to get this out ASAP. He has hinted at another book though, so maybe we'll get something with more of a Maiden focus.