Star Trek endings...
Next Generation's, I thought, was pretty good, though the old Picard seemed, well, really old. But I thought it was pretty thought-provoking overall.
Voyager - Gilligan finally got off the island that was the Delta Quadrant. I was just glad this show was over.
Deep Space 9 - I can't remember the last episode, but I do recall some decent shows as the Station was taken over, then recaptured.