I actually would say he was closer to being the worst than the best - although some minimum innings criteria is needed. Consistency is nice, but it puts you in the pack; it doesn’t desperate you from it. That range is negated by current strategies (which isn’t true at all) is irrelevant here since those strategies were not employed during Jeter’s career.
But really, when trying to disprove who or what was the worst or best or really, any extreme, it’s not readily disproved by describing what makes it ordinary. Now one better method would be to say who was worse. FWIW, I wouldn’t say Jeter was the worst defensive shortstop of his era, either. But I might say he was the worst one not named “Hanley” or “Yuniesky”....