Some will tell you that DOM/L2 is useless.
If that was the case, then they would NOT be full of spoof orders. Why would larger players spoof the order book if it was no use to them ? The answer is - they wouldn't. They spoof the order book and make good money from it. The trick is - understanding what they do and the footprints they leave behind.
I have read the book mentioned - it's not bad for a start but there's a lot more to know about using the DOM (or L2) and how to use it with the actual flow of executed orders.
If you think you can use the DOM to just look which side is heavier and take that side, they you will get your ass spanked consistently.
There are games being played to hook you in, the people playing these games are making a lot of money and they KNOW all of the 'secrets' to trading you learn on websites like this one and all the crappy TA books out there. They know where your stop losses will be and they know how to make it look like the market is rolling over at key points so that you get short before they pile in on the long side with SIZE to take you out.
This is done day in, day out in many futures markets. Google Paul Rotter - he's the master of the game.