I thought the world and the production really great, and the world feels very lived in. Set design was cool and how I enjoyed how its shot. Without going into spoilers, I found the central premise very interesting, and the constant question of what's outside the SILO and whos pulling the strings quite an enjoyable thread to pull at. I do think it relied a bit too much on dramatic irony for tension, and think that when reveals are made to characters, they fall a bit flat since often the viewers know ahead of time.
I loved Rashida Jones in the first couple episodes, and found her performance really believable. I initially didn't really like the main character of Juliette Nichols, but thought her characterization really improves with the last 3 episodes of the season.