I miss all the season 1 characters. I think the biggest problem with season 3 (and to some extent season 2) is that the characters are driven by plot, rather than the plot being driven by the characters. Season 1 had Dolores, Maeve, and Bernard awakening in different ways; William and the Man in Black on their own adventures; plus the corporate jockeying between Ford and Theresa while trying to run the damn park. There's no questions of why this person does that; their actions just flow naturally and silently inform us of their motivations. And the other characters -- Teddy, Clementine, Hector, Armistice, Lawrence, Logan, Elsie, Sizemore, etc. -- each have their own unique personalities and roles that fill in the story perfectly. The way all these characters and plotlines are layered together is really quite impressive.
Halores seems like the only person in season 3 to exhibit some character progression. She's awkwardly thrust into someone's life and grows to embrace it, and it moves her. It's far more meaningful to observe this through Halores's interactions with her family, than through the backstory dumps that Serac and Caleb got. The other new characters in season 3 -- Liam, Connells, Ash, Giggles -- are unremarkable. And the returning characters -- Dolores, Maeve, Bernard, William -- it's like they're "on rails", just absent-mindedly moving forward as the plot dictates. Even Dolores, who's supposed to be the prime mover, is just kinda one-track and boring now. It's like the writers planned out the overall story for 5-6 seasons, but not the characters.
I'm still entertained and want to see what happens next, I just don't feel invested in the characters anymore. Don't really care who lives or dies, and who succeeds or fails.