If you're looking for your first poker book, this is not the one. If you're looking for your 20th poker book, this still isn't the one. If you're stuck on a plane for two hours and the choice is the in-flight magazine vs. this book, then this book is for you.
Scott Fishman said in an interview with Phil Gordon that he hates reading books, and that he wrote this book so you can skim it in a couple of hours. He's certainly accomplished that, as this book is almost completely devoid of any content. It is full of "filler" material, like the rules of the game, hand rankings, a bunch of blank forms for keeping track of session notes, sample tournament structures, etc.
Also, he asked a few pros "What is your #1 tip for aspiring players?" The result are platitudes like "practice makes perfect", "do not dwell on your mistakes", and "focus on exploiting weaknesses in players who are worse than you". This kind of stuff takes up another dozen pages.
His main "message" can be summed up like this: there isn't a single correct style, you'll have to find what works best for you. Don't read books (he didn't), just put in time at the tables, talk to experts, practice a lot, and you'll eventually get pretty good.
Here's my favorite bit of "advice" from his book: "Before I choose a Sit-n-Go, I like to take a look at two or three that are already running to find a 'lucky seat.'...I know this sounds ridiculous, but I'll talk more about positive superstitions in the next chapter." Now mind you, the book doesn't talk about pot-odds until the appendix, where he goes on to say that they're not really important, because "odds are nearly impossible to calculate accurately." Wow! Picking a lucky seat is worth talking about, but basic concepts like pot-odds aren't?!?!
The only thing that makes this book two stars rather than completely worthless is his chapter on Sit-n-Gos. He actually shares some specific strategy ideas that are pretty interesting.
Finally, there is almost nothing in this book that is specific to online poker. Any decent discussion would have to cover the tools specific to online, such as Pokertracker and how to interpret the various stats it generates, which he barely mentions.
I think you get the picture: a quick read, lots of generalities, a waste of time.