This is basically what it should have been: a fun behind-the-scenes look at the making of one of the greatest movies ever. And its two sequels. And the associated amusement parks and video games (okay, I would have been okay with leaving those out). But basically good stuff. You need to know the movie. It won't explain it to you. But if you know the movie, it will be fun to read.
Of course there's the conspicuous absence of interview material from M.J. Fox himself, but other actors add good insights, and the main focus is on the Bobs -- the director and writer, since this was their pet project.
I got a free copy of this from First to Read in exchange for a review.