The simplicity of the film goes hand in hand with the authenticity and depth of the very easy to watch story. The animation is 2D brilliance with every image on the screen having deeper meaning of some sort. The film uses its filmatic space avoiding lulls and capturing the viewer's attention with its very short run time. This is achieved by the craft of Director Chomet who has created a picture that is so well done it does not even feel like its animated. This can be attributed to cinematography used with the animation. A camera seems as if it is filming the film almost as an alternative reality in a medium that would not of been as effective if it had not been animated. Authenticity is evident even with the minimal dialogue acting a throwback to a simpler era; silent film. It does not rely on its dialogue at all spreading it few and far between, however, when there is dialogue it is true to the setting and the nature of the film. It is in French and guess what? There aren't any annoying subtitles.
For some viewers the fact that the film is in French and that there aren't subtitles (I bet the DVD/Blu-Ray will have the option) it may be very frustrating. Also, this is not necessarily a kids movie. Kids will enjoy the magic behind "The Illusionist", but will not appreciate it as much as adults because of the immense amount of symbolism in the film.
Contemporary film seems to be all about glamor, special effects, and money leading to the creation of hit or miss films. However, film as an art is much simpler than that, which is a metaphor that resonates within the must see film "The Illusionist". Remember simplicity, simplicity, simplicity.