In addition to being a very well-done movie, it does a superb job of describing the relationship between the visionary founders of a startup, and the sales guys and bean counters who turn it into a successful business. It doesn't matter that the McDonald brothers were revolutionizing burgers, the telling of this part of the story captures perfectly the same sort of activity that goes on at any startup with a new idea, (emphasis on new). It also captures very well how the suits recognize a good thing when they see it, buy into the vision (but for very different reasons from the founders), and finally take over and render the founders obsolete.
Really great movie for anyone involved with startups.