I am working my way through the Silo series by Hugh Howey. Currently halfway through Dust, which is book 3. I had heard less good things about books 2 and 3, but I'm finding that I'm really enjoying them. I think most people expect the story in Wool to continue immediately and are disappointed that Shift first focuses on backstories and giving the reader behind the scenes information before continuing the main thread. I had the luxury of being warned about the change in perspective so I feel like I was able to go in with the right mindset to enjoy the story for what it was.