Star trek first contact pointed out a huge flaw with the borg that know one in the federation seemed to realise, it seems the borg can adapt to phaser and other energy based weapon but against machine guns and knives they are incredibly weak against. Is it just me or does it seem that the huge irony of the borg i that the more technologically powerful a society is the more vulnerable that society is to them but the more primitive the society the easier it would be to fight them off. When the borg have come close to conquering earth twice in the future we struggled to repel them but if they tried it during say the crusades we'd kick their arses before they could they could say our resistence is futile.