Part one was less interesting because it was mostly just exposition, setting up the plot by sending Voyager back in time, showing us the 1990's, introducing the guest stars, etc. Things picked up quite a bit in part two after the plot got rolling. Overall, I liked the villain and the girl (I can't remember their names), and it was fun to see the crew of Voyager interacting with ordinary people in the 1990's.
Part 1: 6/10
Part 2: 8/10