I liked season 1 for sure, season 2 kind of meandered and didn't really know where it was going or what it was (though I still enjoyed it for the most part).
Season 3 was like "oooh no, we're leaning into the sci-fi and evil nazi science angle" and it was wonderful.
Throughout this show I could never figure how the resistance was ever going to beat the Nazis. They have effectively taken over the world and most of the conquered Americans have assimilated. But then in season 3 they expertly start sowing the seeds that could lead to their downfall. I was surprised at how unsettling the destruction of the American history scenes were, especially the destruction of Lady Liberty. If anything is going to piss off Americans it's the destruction of historical artifacts.
Also Smith's story with his wife rebelling because she's afraid her children are going to be put to death was also great. It makes me wonder if at some point Smith is going to turncoat. It would be better if he didn't because he's such a good villain but there's room there.
Was also glad to see Juliana off you know who. The way she looked as she watched you know who die, as if she were a wild animal watching the life drain out of her prey, that was her coolest moment in the entire series.
I hope the show gets at least 3 more seasons.