A lot of the interesting issues and dynamics within a city occur over things such as socio-economic issues or ethnic issues. But they require a much more elaborate model of human behavior. ↗
Also, after people play these Sim games, it tends to change their perception of the world around them, so they see their city, house or family in a slightly different way after playing. ↗
And every now and then people find the bugs, and they interpret those as cool failures in the Sims terms. For them it's like a treasure hunt, you know. ↗