I enjoyed the movie. I liked the premise of focusing on people at war who don't have access to information to even understand what was blown up, or who may have initiated. Most of the complaints in the comments I don't agree with, because I get why the focal character was the person who was new to the ship. Movies like this need a character to explain things to for the audience. So that isn't a problem so much as it is a common method to show the audience and they did it well.
I think the tension surrounding lack of information was really good for such a self contained movie and cast. There were aspects I didn't love like one of the main Russian characters threatening to blow the ship up after her partner was killed, but over all her questioning who is her friend, and the regret one of the characters felt was great.
I actually loved that one character was left for dead and then brought back only to die immediately. While I wish it was spaced out a bit more, I love when movies play with the characters.
As for other reviews, it is very telling that basically all of the 1 star reviews have a problem with an aspect of the movie that was basically 2-3 lines at most, and took less than a minute. Your bias is showing.