Quote Originally Posted by Weirdbob95 View Post
Powerful Criticals lets you increase the threat range from 19-20 to 18-20. It lets you create weapons similar to the kukri, rapier, and falchion in the SRD here:
http://www.d20srd.org/srd/equipment/weapons.htm
Taking feats and other abilities to increase your threat range is still a powerful strategy, but I don't think it's any stronger than normal D&D.
Indeed. A character with Improved Weapon Focus, Improved Weapon Specialization, and Improved Critical all in Rapier is a fearsome thing despite the low (1d6) base weapon damage.

What about weight and price? You give them for the base, but one needs to know how they change with the various qualities.

And how about adding a quality Heavy that just increases the damage category. It would be incompatible with Light but that's probably about all. Otherwise, how is one ever going to get into the big damage categories?