People, I think. Whatever I write tends to be more about the characters than anything else; the action of the story isn't so much a driving force behind the plot as the choices the characters make. Example: my English teacher today started lecturing us on how the rise of anxiety in this country is related to the lack of community and communication between the American people, etc. etc. etc.
I now have an idea for a story about two roommates who never see each other.
Reviews make me happy as well, especially if they're not from people I know - they're too nice to be critical.