We had a great discussion on Ringworld.  We decided that the representation of women was sorely lacking.  The population control models they put forwards with Humans, the Ringworld, the Kzinti, and the Puppeteers was very interesting.  The story had a lot of holes, and the plot was contrived in a number of points, especially around Tila.

https://www.goodreads.com/topic/show/2259779-ringworld-thought-questions