We always had someone to talk for the Borg, in every appearance.
In "Q Who?" we had Q and Guinan to basically explain the Borg to the audience.
BOBW had Locutus.
I, Borg and Descent had Hugh and Lore.
So this notion of the Borg being some faceless foe just isn't there, since they ALWAYS had someone to explain them to the protagonists.
If the Borg hadn't been so stupidly overpowered in the first place, it would've been easier to reuse them without "ruining" them.