That's it. I'm sick of all this "Katana" bullshit that's going on in the d20 system right now. Bastard Swords deserve much better than that. Much, much better than that.
I should know what I'm talking about. I myself commissioned a genuine Bastard Sword in Germany for 10,000 Euros (that's about $20,000) and have been practicing with it for almost 2 years now. I can even cut slabs of solid steel with my Bastard Sword.
European smiths spend years working on a single Bastard Sword and fold it up to a million times to produce the finest blades known to mankind.
Bastard Swords are thrice as sharp as Japanese swords and thrice as hard for that matter too. Anything a Daisho can cut through, a Bastard Sword can cut through better. I'm pretty sure a Bastard Sword could easily bisect a samurai wearing pieces of wood for armor with a simple horizontal slash.
Ever wonder why Japan never bothered conquering Medieval Europe? That's right, they were too scared to fight the disciplined Knights and their Bastard Swords of destruction. Even in World War II, Japanese soldiers targeted the men with the Bastard Swords first because their killing power was feared and respected.
So what am I saying? Bastard Swords are simply the best sword that the world has ever seen, and thus, require better stats in the d20 system. Here is the stat block I propose for Bastard Swords:
(One-Handed Exotic Weapon) 1d12 Damage 19-20 x4 Crit +2 to hit and damage Counts as Masterwork
(Two-Handed Exotic Weapon) 2d10 Damage 17-20 x4 Crit +5 to hit and damage Counts as Masterwork
Now that seems a lot more representative of the cutting power of Bastard Swords in real life, don't you think?
tl;dr = Bastard Swords need to do more damage in d20, see my new stat block.