This show had two good seasons and then average third one. Main problem was there was no enough viewers, at lowest only 0.44. Another problem was actors and their story arc.
Katie Bowman: part of the resistance, yet better to be in house wife's in boring land. She wanted to get away colony in LA, and she had ok job being bartender. They moved to Seattle to be in colony and being a bureaucrat and forget resistance. I think she should have been even more active in resistance, because Charlie was now dead, killed by the system.
Will Bowman: The Will Bowman Show. This show revolved too much around Will Bowman/Josh Holloway. So too much smelling their own farts.
Bram Bowman: Being angsty teen and having no direction at all. There was no coherent character development.
Story flow. They left so many loose ends and jumped around places and times so it was hard to follow what was going on.
Woman who helped them to board train apparently was killed by drone, but why didn't she board on the train? If there was that 60sec limit and someone had to left behind and get, then it was stupid way to travel.
Conspiracy theorist/resistance leader. Broussard identified him in the pile of dead ones, but there was also scene where he was alive and accused as a coward, fleeing first.
This had a good idea where to start, but they didn't have main story written, just few paragraphs. This tried to copy Lost mystery with angry Sawyer faces, Walking Dead style road trip with stops and fearing the monsters and Jericho style isolation and government secrecy in the background. And pods for special people like in Wayward Pines.
Biggest mistake they did was not tying ends after every season to wrap it up, if it wouldn't be renewed.
I think most of the humanity was killed in the end. Only those 400k? outliers were left behind to start a new earth. I think those machines were remnants of lost world. They were fleeing from those aliens whose main purpose was to kill any intelligent races. (Alastair Reynolds Redemption Ark)