I know this has been used before in other games, but why not have unique weapons which are actually unique weapons?
For every class have a single weapon with max stats, good mods(and maybe new mods) which will only drop for a character of that class. This drop will be customized automatically for that character to prevent drop stealing and will have no restrictions on what area it would drop in. It would be completely random. Here's an example.
Bob is a ranger. Bob kills a monster in The Falls, which drops a ....red(new color yay!) bow. He picks it up. Its customized for him and has some interesting mods, lets a say a +1 to marksmanship with a 20% chance as well as some health bonuses. As a special bonus, he later discovers, it also has a slightly longer shot range, and does 5 more max/min damage. If we really want to go fancy, we can even automatically put his name on it "Bobs Bow of Marksmanship", though I think that goes a bit far.
It won't unbalance the game in any way(that I can see) and drops like this could even be used by Anet to add to the lore. For instance, they can attach a set of names to each weapon and allude to ancient ruins or some soon to be added feature in that region. If the weapon is destroyed or salvaged, it gets put back into general circulation. And to keep the general circulation high, we could even say that one 'unique' weapon would drop for every x many thousand/100 thousand players. Just so long as they are much rarer than any other weapon/drop in the game.(I was thinking of holding it down to 5 per class, but that might be a bit restrictive, especially when the GW community grows)
I think it would add an interesting flavor to a person's character to have a weapon that nobody else has. And as long as each weapon isn't over done,(like that bows range being outside aggro range of a monster;i.e. monster doesn't know whats hitting him) then it would be an interesting addition to the story.
Flame away.
