The reason the audience rating on this movie is low, I suspect, is because people are expecting every space-themed movie to be like Interstellar, Gravity or Arrival.
This movie is a LOT more intense but at a different aspect of emotions - emptiness and loneliness that most people are probably trying to escape from when they come to the theatre.
The acting is not perfect from everyone but the main characters pull it off well. As with all things space, each year the photography and cinematography are getting bigger and better and this movie is no exception. Just don't expect this to be an 'action' even though it has its moments of 'Asok! Get into the jefferies tube or we will die!'