Well... all in all, while I enjoy the borg episodes and First Contact, the entire Borg - Federation conflict in fictional reality is entirely unrealistic.
I mean if the Borg really wanted to destroy the federation, they could send like, 1000 cubes to do the job, they could take out the Cardassians, the Federation, the klingons and the Romulans... Hell I bet even 100 cubes could do the job.
But no, they send one cube.
Because they hate the Federation, OH SO MUCH.
Especially when it was discovered in End Game they could create a portal to within pissing distance of Earth...