I couldn't believe how bad this is. They took an excellent idea and butchered it on the altar of millennial cynicism. What results is vapid, cynical to the point of fascism, and gleefully repulsive to the point of absurdity. What is it about this generation that seems to make it incapable of getting nuance?
I have to agree with the reviewer who said that the millennial failure to grasp the optimism of better times killed this venture before it started. We truly are in that post-apocalyptic future feared by the people of more hopeful times. Instead of acknowledging that and working with it, even from a darker viewpoint devoid of idealism, the movie just scoffs at the remnants of optimism, kicking it away, snickering, like a dumb hooligan. There isn't even any sense of loss, only purposeless, spiritually and culturally bankrupt rebellion against any perceived constraints (however necessary, helpful, or advantageous) that would dare impinge upon their seemingly unlimited sense of entitlement. Which is quite staggering, when you stop to think about it. So is the shallowness revealed in the assertion that a visionary who contributed meaningful scientific achievements to society is equivalent to a crass, purposeless punk who wants to tear down instead of build up.
The main character and his grandmother are the only interesting people in the movie. The "best friend" is ludicrously vile. He's so over the top that he comes across almost as some kind of demonic equivalent of the mentor archetype who would guide the hero through a coming of age journey in traditional mythology. Only instead of guiding a young hero to greatness, this demon figure is guiding a naive fool to nihilism and destruction. This guide is a representative of a competing vision for the future (a vision that the filmmakers wish would replace the vision of a more hopeful past), and his is a vision to give you chills, in the worst way. He isn't even some rebel without a cause figure. He's just a malicious little pissant who constantly spews out garbage because he has nothing good in his soul. His aggression in doing this comes from a hatred of the good that he knows he lacks.
The two stars are only for the performances of Butterfield and Burstyn. Otherwise, it should get zero.