The worst thing about Voyager wasn't that they kept screwing the Borg, it was that they screwed them in ways that were totally contrary to the nature of the Borg.
In TNG they'd just walk up and take the first shot - let it tear them to pieces purely so they could see how it damaged their drones/ships, then they'd adapt instantly and **** you in the ass with a hyper-spanner.
Even mass-assimilation was a cop-out. They shoulda just left them as breed-when-need aliens, churning out huge batches of cyber-babies to recrew their ships - as that kept the organic side of the Borg less like a 'poor alien slave' and more like a mobile repair unit.
And assimilation of an entire species is so inefficient that it's completely pointless. Fair enough, assimilate a few military leaders and scientist who held unique information of value, but the knowledge of an entire race would consist overwhelmingly of useless trivia and the same information repeated over and over with varying opinions.
Janeway kept coming up with fancy ways to defeat the Borg that apparently no-one from the tens of thousands of other races the Borg had assimilated had ever thought of. Even assimilation tubules were bull****. Half the scariness of the Borg was being abducted against your will and cut to pieces. According to Voyager, you got some tubes in your neck, hurt for a few seconds, then went blank and compliant.