Can you stat a weapon 'realistically' in a combat system as abstract as D&D's? I mean, it ignores all the factors that led to the vast profusion of different ancient weapons. Weapons evolved in response to the specifics of armors, tactics, etc. that don't functionally exist in the system. The best (and I use that term incincerely) D&D had was the old 'weapon vs. armor class table' that virtually no-one used back when it was actually part of the rules.
Weapons should (in fact, can only be, given the combat resolution mechanics) be statted for balance. And any special properties given them should model cinema, not real world combat.