His articles have helped me a lot and I found them more useful than his book. As Doc says on his website "you'll never be confused again." A lot of the terminology used on this site comes straight out of his book. If you follow his principles you will always be in control by bottom lining and the reality factor (accepting the situation for what it is and not what your ego wants it to be) and will be easily able to walk away from any deal. You will never get taken for a ride again.
If you want to read a good thread about putting the system into action you should read this thread by 2nd Tour
http://www.sosuave.net/forum/showthread.php?t=16725
Now the criticism,
I prefer Anti-Dump's Machine to his system even though the Machine is a near carbon copy of Doc's book. Doc's book is full of spelling and grammar errors and is hard to follow because he puts all his techniques into a dictionary format. It's really not a "system" at all. The Machine is a pure system.
A lot of the advice in Doc's book is outdated.
It was obviously written in the early nineties and hasn't been updated since. He advices men to ask women for phone numbers and he says not to leave messages. In his system he never takes into account things like cell phones or caller ID.