I've watched a number of episodes of the show, and I must say, it's actually very good in my mind. It's good that Graeme says that he will take on any dog and any owner with any problem, which is proof of how willing he is to help anyone.
From what I've seen many times, a lot of what he does is purely common sense, and it's so obvious, that it makes you wonder how the owners haven't realized it themselves. An example of this is that people often ask him why dogs do bad things, and he explains that since they respond to it, the dogs have learned that it's how they get their owner's attention. Another time, he was being interviewed on, 'This Morning' and was asked how he would stop a dog from jumping up by a window, and he said he would move the stool which was there, so the dog couldn't jump on it.