Is this all down to semantics? By calling it "lucky" one instantly thinks of good luck, but of course the stat is also a bad luck indicator if it is low enough. Thus, the Warrior's "lucky weapon" is, in these instances, his "unlucky weapon" and because he's such an unlucky kind of guy, he just never gets good in any other particular weapon.
As a Player, I really enjoy the whole aspect of how luck plays apart of all things the character might do. If say, the stars aligned just right when a character was born to be warrior on the battle field, then he has all the right modifiers to be a bad ass at first level. The Fates of Man are really fickle to say the least. Some guys have all the luck and some have none. Most characters are going to be somewhere in the middle.
On the otherhand, if you don't have much luck or natural ability, it is going to be a short character life. Granted, no player wants to play the Quadroplegic, Vegetable who sits in a wheel chair at 0 level. But his friends in his Character Pool, (ie. the other PCs that one player controls,) will gladly thank the Q.V. for his valient sacrifice. Especially, if it meant rolling the Q.V. down the hillside as a distraction, so the rest of the party could escape the gaping maw of certain death.