Given at least moderate quality, upvotes correlate much more tightly with accessibility / scope of audience than quality of writing. Remember, the article score isn't an average of hundreds of scalar ratings -- it's the sum of thousands of ratings of [-1, 0, +1] -- and the default rating of anyone who doesn't see, doesn't care about, or doesn't understand the thrust of a post is 0. If you get a high score, that says more about how many people bothered to process your post than about how many people thought it was the best post ever.