This is not a science fiction movie. There was no science to explain the phenomenon. It is preposterous that another Earth would all of a sudden appear from nowhere. If it somehow could happen, there should have been tidal and orbital effects but none were even mentioned. It is also not an action movie. It is a very slow-paced drama. Not that there's anything wrong with slow-paced drama, but it was not what I was expecting.
The pluses: the visual beauty of some sequences and Brit Marling in the lead.
The minuses: There are two story elements that each could have had its own separate movie. As it is, neither got the development it deserved.
The ending did not do much to resolve anything.
In my opinion the filmmakers could have done better by making two separate movies with this material: a drama, and a science fiction.
The pluses: the visual beauty of some sequences and Brit Marling in the lead.
The minuses: There are two story elements that each could have had its own separate movie. As it is, neither got the development it deserved.
The ending did not do much to resolve anything.
In my opinion the filmmakers could have done better by making two separate movies with this material: a drama, and a science fiction.