The book started out promising, but ultimately degenerated into putdowns and gloss-over.
Masahiro Sakurai, while an esteemed game developer, doesn't address readers' questions with much insight or humility. His answers to reader mail reek of arrogance and presumption, without giving actionable insight into becoming a game developer.
The book would have benefited from better organization: Programming Game Graphics. Designing Battle Systems. Balancing Power between Characters. Online Multiplayer.
Instead, the book reads as a series of Q&A points: short & easy to digest, but also helter-skelter without much grouping of similar topics. It seems like it was just taken verbatim from Famitsu columns, chronologically, rather than ordered with any kind of categorical sense. It was hard to finish because I would find a topic interesting but then get panned or glossed over by smart-alecky answers, such as "Of course game direction is the best job out there," or "We have to differentiate characters but don't have enough time, so we had to cut many interesting ideas. But those are top-secret."
Not full disclosure, and not something I expect to make me a better game developer or planner.