Observation

A medievalist's understanding of the ancient world is very different than a classicist's. This is frustrating and highly disorienting, at least for the classicist.

I'm not sure how much of the structure of the medieval education system (for example) is appropriate to attribute to Aristotle (or even the neo-Aristotelian tradition), although people in the Middle Ages may have believed that they were essentially following ancient sources. One might at least note that their knowledge of Greek texts was often second-hand, either through Roman writers or via Latin translations of the originals.