Agreed. Any Atiesh is amazing because they're no longer obtainable.
The most legendary lore-wise, I think, would be the glaives because everyone who's anyone would know whose they were and what they meant.
The most legendary weapon type? That's a pretty tough call... I guess I'd have to agree on the bow, because at least for a little while, the fact that it negated the need for ammo was HUGE.