The season finale was a real bummer for me. I love Ashford and hated to see him die, but he did go out in a cool way. No Drummer, which was a letdown. Will have to wait until next season to see her reaction to Ashford's demise. I also hate cliffhanger finishes, and the final shot being of Marco and his and Naomi's assbite son as they launch an attack on earth. Holden's story was wrapped up in the first two minutes, so the focus was mostly on Bobbi, Avasarala, and the hunt for Marco. Bobbi's story played out as a disconnected side plot the whole season, so I'm hoping they tie it in with the main story next season, which was hinted at by her message for Avasarala. I didn't care much for Avasarala's story this season. It didn't matter to me whether she was re-elected or not. Yes, she is an interesting character, and it's fun listening to her creative uses of the word "fuck," but at the end of the day she is just another political bureaucrat operating out of self-interest more than anything. Her successor, Gao, won't be any different, I'm afraid, despite Avasarala's words of advice.
I really enjoyed the season overall, the ending just left me wanting.