He really does make it simple. Very logically organised to make the learning seem easy. My only thing I would point out is that if you are going to use this in conjunction with other learning models/approaches - other ones take the default "you" to be tu (informal) whereas Michel Thomas uses usted (formal) as the default "you". I think he is right to - his approach makes the learning very clear and simple. It is a good approach. But it can get confusing when learning with other methods too.
However I would not let that put you off. His other approaches to learning, e.g. using mems for vocabulary and concepts like the "a" or "e" track are ingenious. I am teaching my son from home and these concepts have really helped him to nail verb endings. This man seems to have an intuitive understanding of how human minds work and learn, and applies it brilliantly to his methodology. Plus he is affordable unlike Rosetta Stone :(