^ I hear what you're saying, but that's a cop out. (Sorry.) A simple projectile weapon has to be one of, if not the most common sort of weapon in existence. To not be able to defend against that is just silly, which was my point (hence the ).
Well, the other tack to take is that it was an attack involving bullet-shaped force-fields meant to simulate, but not duplicate, machine gun bullets, making it a new and bizarre type of energy weapon that the Borg, conceivably, might not be adapted to.