The Borg should NEVER have been used on ENT and doing so was a mistake. With that said Regeneration was easily the best Borg episode since VOY's Scorpion and one of my favorite episodes from the first 2 seasons.
"Well, I come from a long, long line of smartasses. Smartass is allergic to dumbass. Itís actually a physical allergy, as in youíre repulsed by dumbasses."