On paper the Borg should be the toughest race in the galaxy right? Hundreds of species, thousands of planets, all that knowledge via assimilation. They should be unstoppable but they've been used so many times the Borg have ceased to be interesting.
Strong yes, but not what I would call "tough."
A Borg drone is like watching someone who is drugged up stumbling into a fight, not an example of toughness.