The guy in the top comment has absolutely no taste. The movie has several nail biting scenes. it's a psychological thriller, not a space drama.
It presents, very discreetly, many philosophical dilemmas. Us not knowing exactly what Dr. McBride's goals only inticed my curiosity and anxiety. And the resolution felt very satisfying, as it comes down to something very realistic and that had been hinted along.
I feel like it could've leaned a little bit more into the philosophical questions, the dilemmas humanity may have to face, but my guess is they didn't wanna make too obvious, and let the viewer draw their own questions, which is a good direction.
All in all, great movie. Very realistic in every way, very intriguing, nail biting and beautiful. Unlike the other guy, I didn't find it very slow AT ALL, quite on the contrary, I was often checking the run time and thinking "omfg they're not gonna have enough time to finish everything! are they gonna end the movie without X doing Y? Are we not gonna see what happens?" But that was not the case. Everything was answered, everything had more than enough time to go down without it feelings rushed or anything being left out. I'm glad they tackled everything, unlike other movies where they'll intentionally leave something answered to give way to a sequel. This felt complete, it had closure and it was satisfying. Not the best movie of all time, not a must watch by any means, but a good flick, good nail biter that is never in your face, never TEDtalking you. 8.5/10