The animation is awesome, it makes the logic connection much more clear and easier.
Prezi is really revolutionize traditional reading habits. It transforms chapter-by-chapter/slide-by-slide, liner reading, to a more hierarchical and intuitive way. It takes less effort to make sense, so you can focus more on digesting and re-thinking, not only comprehending.
Prezi is very nice and I've seen a couple of presentations which have benefited from the hierarchy and demonstration of relationships. However, this presentation seemed to be animation simply for the sake of animation. The spacial relationships seem to have almost no bearing on the logical relationships. I too was unable to finish the presentation.
I totally agree with you! This is a great example of why more features hurt and less features are more useful. I know that the design is great and the transition or animation is nice looking. But the main goal of the users is to read the content not to enjoy the beautiful animations. The animations become a hindrance for the readers. It distracts the readers from the content. It slows down the reading. When adding features, don't just be impressed by the technology. It is crucial to think about what is the goal of the users and how this feature can help achieving this goal. Never add a feature because it is fancy or just because you can do it.