This episode has continued the old-school Star Trek style that old school trekkies love so much. The storylines are exploration-based, requiring a lot of active thinking on the audience's part. The general direction is commendable.
That said, I didn't like this episode particularly much. First of all, there are so many subplots on move at once, so it may confuse the viewers a bit. The show tried to be faithful to old trek, but the old trek does not present everything in a rush. Can be improved.
Most importantly, I am getting tired of Sonequa's acting style. Recently, I feel like whenever she is trying to show strong emotions, she speaks in a slow,over-stressed tone that sounds not unlike giving a public speech to strangers or a students. She tries so hard to be moving and it feels extremely unnatural. In the last episode, when she addresses Tilly's problem, it really freaked me out: Why would you talk that way with your close friend? I don't know why didn't I notice this problem last season, probably because it didn't happen. Oh Martin-Green, please stop giving us more of your artificial emotions.
Despite all this, this episode is very interesting and solves some continuity issues. My vote is seven.