Started watching it soon after season 1. I was hoping to discover more about Gauna origin, Ochiai's past, how did Ochiai managed to make parasites and enter Kunato's body and whatnot. Sidonia no Kishi: Daikyuu Wakusei Seneki does not explore either of these but the series progresses further where Kobayashi tries to push the boundaries and close the gap between humans and gauna.
Although, the series check marks all the generic space mecha gundam boxes yet there is certain je ne sais quoi to it. I enjoyed it thoroughly and never felt that I am just dragging myself just to complete the series.
I'll recommend it to people it has a good production value since it is coming from Netflix and storyline is also pretty captivating.