The planet/Holden stuff worked pretty well, nice payoff with the Cancer meds macguffin. Nice to see the actual Miller assumingly one last time. Interesting additions to the background plot of the "things between the spaces". Really spectacular CG background when Holden climbs to the top of that spire, showing off how artificial that planet really was. My question to the Belters choosing to stay there: The big fat warning sign of a bunch of moons equidistant to each other in orbit. No Bueno.
The Bobbie stuff should have failed pretty easily, but it worked out well, and had probably the best CGI backgrounds yet. The explosion at the dock was really fantastic.
If Averserala hadn't left for the moon, I'd be confident that Marco's plan wouldn't succeed, but now...it feels like it will. That's a mighty big cliffhanger to end on...
I'll miss Wei, and while a complete bastard, I assumingly will miss Murtry. Burn Gorman can't get away from that type of character.
A slightly shallow season for Alex, that I hope gets rectified in Season 5.
I have a bad feeling about having to deal with Filip, and how Naomi will react to what he and Marco have probably done. Naomi had a strong season, and her "from where you are to where I am" speech was pretty great.
I loved the bit of redemption for Ashford, after realizing how close he got to fucking everything up in S3. Knew the right way to handle things with Marcos right off the bat, and sadly was right. Got to go out with a slick bang (sweet move using the momentum to his advantage), while showing his ruthlessness by sacrificing that other belter. Sucks to see him go out, but maybe he did enough with the message he sent to either avoid what's about to happen, or at least help prove something going forward. RIP Klaes
I didn't expect to see many/any of the other "named" actors (Jared Harris, Elizabeth Mitchell, Chad Coleman, and David Strathairn), so I was surprised we got that much of Strathairn, and happy to see Coleman back for I think 1 episode. I hope we get more of Coleman and Harris next season, if this Belter thing takes off with Marcos attack. At some point the Protomolecule Fred/Dawes has, will come back (as well as that crazy doctor that Dawes took)