Can you explain how it was "pure propaganda?" That's exactly the type of stupid statement that you're criticizing this movie for.
You, along with a lot of other people, need to learn how to properly view or read sources. You're exactly the type of person who probably whined and screamed about fahrenheit 911. Documentaries are supposed to be factually accurate, yet OHMYGOD, sometimes they don't present all the facts. I can't think of a documentary I've seen in the last five years besides a nature show that wasn't trying to persuade.
When you have an agenda, you have a bias, but I really hate that term because it is used to devalue and discredit constantly. If we threw out anything that's biased, we'd throw out practically every primary source document in existence, and the profession of historian would cease to exist.
It's up to viewers to question. Another perfect illustration of this flawed approach is wikipedia. Because it's not perfect, should we throw it away? Read responsibly, goddamnit.
When you boil it down, AB is an aggressive corporation that is totally hostile to anyone who could be a potential competitor, even if that potential is pitifully low. While Beer Wars certainly was biased, there is definitely more than an element of truth to the movie.