The plot is really basic. Spoiling any of it would spoil a good chunk of the movie, since not much actually happens. Most of the movie is interaction between the two main characters, and I thought it was really well done. One thing, watching the bonus content, I think they actually did a good job cutting the scenes out, especially the scene with Jennifer Lawrence and Chris Pratt on the video call. I was like "Ouch. What a gigantic a-hole." But it was still interesting to see, and I enjoyed the bonus features as a whole.
I liked the technology in the movie. From Star Wars to Galaxy Quest, my favorite things are the light sabers, lasers and every other type of gadget they come up with. If not for the technology, it would be just another drama. This movie does not disappoint. It's familiar yet futuristic. And I like that Pratt's character is an engineer, because you get to see him tinker with the technology more than someone "less inclined" would do.
At the end of the day, it's a drama in space. I thought it was a great story because of the science fiction setting. If you're looking for action, I would look elsewhere. The danger does not seem very pressing until the last part of the movie. If you want a good story done by great actors in a neat background setting, I highly recommend the movie.