Hugh is what weakened the Borg for me, though it really begins when the writers decided the Borg needed a spokesperson (is that a spox now in texting English; I always mentally rhyme it with Spocks).
When we first meet the Borg, all we know about them is they're dangerous and harvest technology. They appear to simply be an individual species that implants themselves. They don't really start going after other people until BoBW.
I liked the Borg a lot better before they selected a pitch man.