A simple weapon perfect as a family heirloom and well suited for beginning adventurers. (Especially if the swords unique method of gaining it's magical properties still makes it appear to be a mundane weapon even when subjected to magical scrutiny and detection.)
Simple and straightforward item.
I'm not certain how to use it in a game, though. I think most games skip over the reality of sword care. There tend to be no penalties for not cleaning, oiling, or sharpening a weapon. This is good in one way because it ignores some of the more tedious tasks, but it does skip over the reality.
Of course, anyone who has ever owned a real high-carbon blade would kill for this weapon.