I was never happy to see the Borg show up in Voyager.
As I see it, they were already wasted in TNG with characters like Hugh and the Borg Queen. They had already been "humanized" and everything that made them mysterious and exciting was lost.
When The Borg arrived in Voyager, everything about exploring and meeting new species were gone. From that moment it became too much of the Borg with adventures which could actually have taken place in TNG in the Alpha and Beta Quadrants.