That isn't what she was saying at all. Whether or not the events in the movie coincide with the real life events has little to do with whether or not it is a good movie. If the Godfather was based on a true story, but changed real life events to tell a better story would The Godfather turn into a bad movie? No, it would be just as good as it is now, the real life events are irrelevant.
Matt, so in your opinion the only way a movie can be bad is if there is a good movie you can compare it to? There is a value in being groundbreaking, but there are plenty of things that are groundbreaking but not necessarily good. If Transformers was the first movie ever made, it would still be a bad piece of art. It would still have all the same issues whether or not other movies exist. Comparing it to other things makes it easier to see those flaws, but those flaws exist with or without those other movies.
No, I just think the use of comparisons is a good way to categorize, analyze, evaluate, and understand something.
Most learning works best when it builds off of what we've already learned. There's a term for that, but I can't remember it right now (which may or may not be ironic).