I just thought of a show that Manifest reminds me of -- Falling Skies! Good cast, interesting idea, doesn't know what to do with that idea, so they don't really do anything and then move onto the next season.
Hopefully they've give us some real answers before the show ends. I enjoy it, but it was getting really frustrating that we were up to Season 3, and the show still hadn't really given us any real answers about what the hell was going on. Even Lost started to explain stuff by the time it hit it's third season.