This can't be a documentary, as another reviewer already said. For starters, there are many "intimate" moments caught on tape in the most unrealistic way (e.g., a kid telling his machiavellic plans to destroy another candidate's reputation - all steps of his planning and executing are recorded), the camera shoots sometimes at angles that would be impossible to shoot without the cameraman looking really awkward, the characters fit perfectly well into their roles in the plot (which is odd for a documentary), etc., so this casts serious doubts on whether many of the film's good points are real or fake.
But as a fiction, is it interesting? Well, more or less, because the main interest in the film is to catch a glimpse at contemporary China, and a fiction destroys this unbiased objective. The film rather reinforces some stereotypes and doesn't show anything new. The novelty would be that the problems of western elections can also happen in China, but this is discarded if the film is a fiction.