Sure, he's maximizing his profits based on his popularity, who isn't. But to say that his book is no good is a damn lie. Why do I think this? Well, because that is the only book I had read for a long time on how to play NL hold em and I've won plenty of money doing it. Sure, I hit pitfalls along the way, I learned the hard way when to be aggressive and when to play differently (in the beginning I overlooked the part about how to play against weak opponents). I think he didn't change the NL section this time around because there wasn't anything to change. If you incorporate his teachings into your own style, you will be capable of playing power poker. Name me one book, just one, that is a better guide to playing NL ring games. The only other book that comes close is Pot-limit No-limit by Ciaffone and Reuben. It's a nice book. I took Mason's recommendation and read it. I learned some things from it, but I can't say it's influenced my game to the extent that Super System did.
When praising the original Super System limit section, you are aware that they no longer play the game with a single blind, right?
As far as the Mike Caro section of SSII, well, that's Caro. However, there is some useful stuff in that section as well. I'll leave it up to you what is helpful to you and what you already know. Many readers have no clue about tells or some of the other things Caro talks about. Caro has his place in developing poker players. He, like many, can be a useful resource.
I won't argue the internet section, however, that isn't what sells the book. What sells the book is the fact that it shares valuable information on how to play the game by the man that has dominated the game for many, many years.
I do not think that you could honestly say that one would be a worse NL hold em player after reading it, but I guarantee that one would be better it they are able to understand the concepts.