One of my pet peeves is writing just to write, just to fill space so the paper is as long as the professor wanted it to be. Although this professor didn't set a certain page limit or minimum, my paper is shorter than I expected it to be. But after going over it a dozen times fixing little things, I think it turned out just fine. I'm jealous of people who can take complicated concepts and explain them in very few words, so I hope that's what this paper turned out to be.
More likely, though, I'll get a list of things I need to discuss in it for the final paper and presentation. Which is fine...that's why they call it a "draft."