[Suicide Junkie]

I don't think the Enterprise had a chance in hell to defeat the Borg. If they weren't after Picard, they could have easily blown the Enterprise apart before it could even get off a shot.

Well, they'd get to fire a few shots, but they wouldn't do any noticable damage.

The borg cube only needed three shield-sapper shots to disable them, and then start cutting bits out like a roast.

The Borg are extremely powerful, but they have no real direction, and are very narrow-minded. Tactical superiority, but no strategy to speak of.
They do not spend resources on "insurance", or anything without immediate value.

IOW, they are perfect for a monster race, with powerful and dangerous single ships, yet nearly harmless in the big picture.