What do I mean by "realism" in the context of a role-playing game? In essence, a general resemblance to the real world except where explicitly and intentionally countered by the background material.

Thus, a "realistic" fantasy setting may have cultures, races, languages, monsters, and technologies unknown in the real world and improbable or impossible according to our understanding of physics, but these are explicit and intentional differences. Having characters able to consistently fall 50' onto cobblestones and walk away would still be "unrealistic" in this setting (unless the setting also had low gravity).