Sorry to hear you didn’t like it! As a sci-fi and alt history nerd I’ve rewatched it a couple times with delight. Since you didn’t get past episode 2 I can’t speak to how much (or little) character development there was. That said, my favorite characters definitely grow on me, season 1 to end of season 3 takes place over 40 years so there’s a lot of passage of time for characters to mature.