Well, as someone with a BA in English who served on advisory committees for professors and wrote a number of critical papers dealing with everything from films to articles to literature, I can safely say that I know a bit about whether or not a dog training magazine is worth my time.
However, I'm fairly certain that without that schooling I'd be able to figure it out, and that's the point.
Whether or not something has "worth" is entirely up to who's in the market. I don't deer hunt, nor do I have any interest in deer hunting, so a deer hunting magazine is worthless to me. Most people on this thread don't think highly of CM's training methods, therefore to them an entire magazine revolving around CM and his training methods would be pretty worthless.
If you are a CM fan, fantastic! Rock on with your bad self--you now have an entire Dog Whispering magazine to enjoy (I have nothing against CM--I take bits and pieces of knowledge from lots of dog trainers). However, to suggest that only people who have their own magazines are qualified to have an opinion as to whether they'd want a certain magazine is just silly.
If you are talking monetary worth--I absolutely think that magazine will make money. On top of being charismatic and good looking CM is a marketing genius. He could probably bottle sh!t, slap a smiling picture of himself surrounded by his pack on it, and people would buy it. But worth from a business perspective and worth in the larger sense of what the magazine will contribute to the dog world are two different things.
Either way, who cares? The people who don't like him will thumb through it in Barnes & Nobles and shake their heads in dismay, those that are fans will buy it and enjoy it and somehow life will go on.