It must be said right away that this is not a 2012 film where the emphasis was on visual effects. In this film, the budget did not allow to make it beautifully. Therefore, "Greenland" is "2012" at minimum wages.
Before you is a family of Americans. As they usually do, a plot without family problems is a wrong plot. The marriage of the main characters is bursting at the seams, their child is sick with diabetes, and then the apocalypse has struck.
The main crap of the film is that the creators did not strain their convolutions and did everything as always. The viewer is able to read the actions of the characters in the film in advance, down to the smallest details.
In the film you will find: dubious family problems; complete lack of organization of the US authorities; stupid actions of the characters due to panic, running around. However, the most important thing is missing - a normal, expensive disaster.
As a result, the main claim to the creators emerges: if you really did not have the honor to bring in something new and original, then at least you had to show the normal end of the world.