Broken Sword in Demon's Souls. I wanted to be ridiculous and try to run through the game with one...it's not working out. Or the broken Giant's Knife in Ocarina of Time. But my vote is still Demon's Soul's Broken Sword.
Damn, I got ninja'd.demoman_chaos said:The Broken Sword in Demon's Souls. It is only useful since you can upgrade it into a decent sword, otherwise nil damage and poo range.
The Slaves Shield is also very very useless.