Unpopular opinion - I enjoyed this more than The Handmaid's Tale.
It lost a star simply because I think the effectiveness of the tale was lost a little in the multiple viewpoints. I don't think "Baby Nicole's" viewpoint added anything to the story, if anything it detracted because it wasn't as well written or fleshed out as the other two. I think the story could have been told just as well if we only had Aunt Lydia's perspective, just as we only see the story through June's eyes in The Handmaid's Tale. The "twists" as others have said were fairly predictable but I didn't go into it expecting a thriller/mystery so that didn't bother me as much as it seems to have irked other readers.

This was always going to be a difficult book to write and release simply because of the hype around the first novel and living up to the varied expectations of readers. While it wasn't perfect I think it was a solid effort and a worthy sequel. I ripped through it in two days.