I thought it was very middle of the road. I didn't like but I didn't dislike it, it was inoffensive. I watched it without a problem but I wouldn't rush to watch it again. It was an improvement over last week, in my opinion.
I liked that the episode had a slower pace and the majority of screentime was with only two characters, it was a breath of fresh air and a welcome change from the usual hectic ADHD episodes we get.
Ralf Little was a wasted guest star and I thought the episode went downhill when the humans woke up and started a shoot out. I thought the episode had some decent, if basic, sci-fi themes and would have rated the episode higher if the Doctor blew up the ship and they left and it ended with a reveal that all the humans were frozen on board.