I liked the slow build-up beginning in "Blood Fever" and culminating in "Scorpion." I'm not sure where the whole thing went to hell after that--maybe "Dark Frontier?"
Kes threw Voyager out of Borg space in "The Gift." Outside of Seven back-tracking into their space in "The Raven," I'm not sure we ever had a good reason for seeing them again.
But it has been a while since I bothered with Star Trek: Voyager