A major weakness though was that they totally did not address the class divide that was set up throughout the series. There was no payoff at all to that. Disappointing.
Medusa and Black Bolt did say in their speech that they would move forward with the elimination of the caste system as Medusa's parents had wanted, but in a better, less self-serving way than Maximus would have.
The irony is that the Royals ended up doing everything that Maximus said he wanted to do -- ending the caste divide, relocating to Earth. In a sense, he was right all along. But of course, he was the designated bad guy, so it had to turn out that he didn't really care about all that and was just interested in his own power and self-aggrandizement. And there was, like, one line of lip service to the idea that he planned to come to Earth as a conqueror -- something that was implicit before, but never really explored, like so much about this show. They spent so much time on the Royals' interactions with Earthlings we'd never see again after 2-3 episodes that a lot of the more important storytelling got short shrift.
I mean, holy cow. Gorgon's surfer friends either died or disappeared. Karnak's ladyfriend loved him and left him, and all the others in that subplot died. Black Bolt's big Hawai'ian friend was there for a few episodes and then just left. Crystal had a couple weeks of soap opera with the blond dude and his mean vet ex, then they were just gone. Declan was significant-ish for a while, but here he was just killed off by Gorgon with little fanfare and no followup. The only Earthly guest characters who made it to the home stretch were Louise and her boss whom we haven't seen since episode 2.
By the way, the bit with Louise giving her father's ashes to Medusa to inter on the Moon was the one really touching moment in the whole series. And, amazingly, the show actually followed through on that and gave it a payoff. Although I'm not sure interring his ashes in the middle of a city in the process of collapsing on top of them was exactly what Louise had in mind.