I agree that his message of diet, exercise, and the dog is a dog is a great message. Hopefully that is what some people take from his show.
I have, however, met many people who think you just square your shoulders and walk, and the dog magically obeys, they do not 'see' all the little corrections he does. They also do not 'hear' about the exercise.
I have had clients tell me that Cesar would have done it faster, and I have to tell them they need to choose, stay with positive training or add correction based training. If they want an 'instant fix', get a prong (I know, technically negative reinforcement, not punishment). If they want to correct, get a choke. I can instruct them there, and teach them to wean off the tools. But they came to me because I do mainly positive training, they did NOT want to use those tools, and that takes longer. Most people I have soke with do not recognize what he is actually doing, and when they are told they say they do not want that.
I also point out that at the end of my training, or any other thorough trainer, you have a dog which obeys OFF LEASH. I guarantee that if that English Bulldog was taken off the collar it would have reverted right back to the old behaviors. Cesar does not spend enough time there to teach off-leash manners. Even if the prong gives you an instant good dog while on the prong, it takes time to wean off it. As soon as that bulldog realized that when he stood up and stepped towards the ball or water he got no correction, he would have jumped right back in. Problem was not solved.
If you alpha role a large dog and you are not physically able to handle it or don't know the technique, then you are at risk for a bite. He is making it look easy, when it is not. And if you alpha role a dog which has people fear issues and not dominance issues, you are at risk of making things worse.
THAT is my biggest beef with him. He misrepresents himself, and misrepresents his progress in some cases. He gives people the idea that if you stand up straight and pretend you are cleopatra, you will solve all of your dogs issues. That just is not always true. True aggression, fear, and real dominance issues take much more finesse than he is able to show on TV.
That is why there is a huge disclaimer every time the show comes on.