This isn't a science, and perhaps not even terribly important, but I think Aristotle is subject to this effect. Almost every Aristotelian I've encountered on the internet is a Thomist, leading to the impression (in my estimation) that Aristotle is some kind of a proto-apologist. And of course, there's a list of Aristotle-fails, like the women's-teeth thing or the thing about air rushing in behind a thrown ball to maintain its motion that are either false or misleading.

On the other hand, there aren't good reasons for most people to study actual Aristotle. Nevertheless he does show up as a foil in odd places.