I mostly play games that span generations so I have not created very many new games. I think in the thousands of hours I have played since the game was released I've only done that like 3 times. In those games though, I've played a variety of households from 1 sim to large families as I generally end up playing more than one household in the save game.
For the first two new game saves that I started, I did start with just one sim. For my current save game, I started with the "Surviving the Holidays" scenario, so I started with two sims...who hated each other. They are now married and have a kid.
One of my favorite things to do once I have a game going is to add households created by other people whom I follow on the gallery and play those in between playing my own sim household in the same game. It gets me to do types of Sims that I might not create myself with styles that I might not pick myself, and for those gallery downloads I pretty much only download households with at least 2 adults and 1 kid, not individual sims.
