The video is wrong. It would have to be:
STARRING: Jeri Ryan as Seven of Nine
Co-Starring: Kate Mulgrew as Kathryn Janeway and Robert Picardo as The Doctor.
I do agree that after she arrived, VOY became too Seven heavy and by S7 I had lost interest in it. True what she went through would have been traumatic and recovering from it would take time, as she would need to learn about being human, but not at the expense of other characters.