I see where you're coming from.

I enjoyed actually reading the book -- it's a page-turner, at least -- but after I finished reading it I had a feeling of: "Great! Now I'm curious as to what really happened." Similar to how I feel after watching a film that purports to be "based on a true story."

And, yeah, it's really more about Sega's marketing efforts than anything. It's a story of the business side of things, with less detail about technology, game design itself, etc. And that's a shame, because there's a more interesting cultural tale there, I suspect.

Also, I believe this book was actually written at the behest of Seth Rogan and Evan Goldberg. They also write the (god-awful) introduction. And they're apparently making a film based on the story. So treating it as one would treat a "based on a true story" film is probably fair.