I don't know exactly what to praise first.
First, there are the facts. They are very important. The doctors featured in this documentary have conducted numerous thorough nutritional studies (among them the likely most extensive nutritional study ever performed, the 'China study') that present compelling proof for a simple fact: Eating animal-based foods will make you sick. Eating a diet of whole food, low fat, plant based foods, will keep you healthy. However, they did not just find out this big secret, they used it very successfully over decades to treat - and cure - severely ill patients that had already been 'given up' by conventional medicine. When I first heard this story and saw the proof (I read the book before viewing the film), I asked myself 'Why did nobody ever tell me that?' The documentary answers this question, and you will not like the answer (it has a lot to do with what is more important for the US government, the financial well-being of its big food companies or the health of its citizens)
Second, there is the movie. Apart from bringing very important information, it is well made and entertaining. Nobody likes to hear talking heads reciting scientific data, regardless how important it is, for the length of a movie. The way it is made, weaving stories with background information, makes it worth viewing also from the entertainment point of view.
And third, there's the fact that the entire film crew (producers, directors, cameramen, cutters, even the interns on the set) and the composer of the music score all adopted a lifestyle based on plant based nutrition. If this does not tell you that the information presented is credible and convincing, then what does? Go see the movie. If possible, go for one of the pre-screenings or see it later in a cinema near you. And most likely also at the Academy Awards presentation...
Best regards, Andy