First of all, I think this book can be useful for a number of people, especially if they are starting absolutely from scratch and they have never tried to write short stories or story-driven RPG scenarios.
That said. It really feels a bit like a laundry list, and that some of the advice doesn't come so much from experience but from reading other books. Also, there are many typos which make it irritating to read. Finally, The Three-Tiered Series part (most of the book) feels like riffing on the first part, The Three-Act Structure.
In short: not bad, but I expected much more.