The director has some serious brass balls to be running around talking about how realistic the film is. In scientific terms it's roughly as plausible as Star Wars. There's some shit that anybody who knows even high-school level astronomy or physics would be just laughing at.
But that's not the least of it. The plot has absolutely ridiculous contrivances that stomp even the most resolute suspension of disbelief into goo. I really thought they were going to eventually drop the obvious shoe of saying "oh it's all a hallucination, he's back on Earth taking a shower" because it's about that wildly implausible in the second half of the film.
Also an extremely dull and conventional character arc.
Brad Pitt gives a good performance in service to an horribly done film.
The trailer was already bad. It looked like a mashup of three different films with the connecting idea being that the protagonist has some sort of weird daddy issues. Also bullshit 'science' and the likely plot twist that "dad has been the bad guy all along" being telegraphed from three miles away.