Many reviewers didn't like it. I liked it - it's a neat philosophical exploration of what real love is. In a way it's Beauty and the Beast in space.
Here's the thing - his hibernation pod has failed and he is lonely, so he wakes her up from hibernation, ending her chances of reaching the colony planet and fulfilling her ambitions of staying for a year then returning to Earth. The first third of the movie, after he wakes her up, waiting for the inevitable moment when it must be revealed to her that he woke her up and she didn't wake up by accident is excruciating. I found this part hard to bear, as their happiness at this stage was all based on a lie.
But the plot is very neat actually. Strangely enough the real love story follows in the last third of the movie. '
Spoiler alert - don't read on if you don't want to have a fairly broad idea of what the movie's about.
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But at that point we find out what Passengers is really about: real love is demonstrated by sacrifice. How much someone sacrifices for another shows how much they love that person.
But then again, perhaps the plot is too neat - perhaps the opportunity to make the ultimate sacrifice is too available for both characters. It might imply love can only exist where both have made the ultimate sacrifice.
(The situation in real life is perhaps more complex, where one partner sometimes sacrifices more for the other.) (But this is what grace is from the human point of view - accepting the sacrifice another makes on your behalf graciously.) (From the divine point of view grace is making that sacrifice.)