^^ That's exactly it.
Making Michael is written largely with the use of direct, complete quotes, so it's as if the collaborators are telling the story rather than the author. 90% to 95% of what is said is highly positive or takes lighthearted jabs at Michael - for example, there are a few funny stories about his poor driving skills. Nothing rude, just joking around, and it reads beautifully.
There are a few stories, however, that paint Michael in a less-than-positive light. Brad Buxer, for example, speaks on the Stranger in Moscow credits, and while he doesn't seem to mind that he wasn't credited, it's very obvious that he should have been.
Midway through the book, there's a section that speaks specifically about Michael's songwriting process (i.e., vocally dictating what he wanted to hear to a studio musician and/or having them play randomly until he heard something he liked). Bill Bottrell and Matt Forger said that the music that resulted from this process was of Michael's creation, and that they were simply the source through which it was produced.
Two other collaborators (I can't recall who right now), however, said that his process borders on songwriting, and there were times when a guitarist/pianist who came up with the chord progression in the final song was not credited and should have been.
It's a very unbiased book. Everything is presented honestly, through the mouths of the people who were there, and doesn't shy away from people saying, "Michael was wrong with this" or "Michael shouldn't have done that".
Don't let it deter you though. As I said, well over 90% of the book is immensely positive and a great read.