That's it. There are no levels to complete, vilains to snipe or bosses to defeat. You eat and you pee.
To be helpful: Every game of Maxis deals with either making money, being successful, either by building cities, here you build a career, or a family or keep improoving your house. Usually all of these at the same time. Often, Maxis includes scenarios that give certain challenges, either troublesome kids; or in Sim City, burning cities with disasters. In the Sims there are burglars, job cuts, trash to take out, sleep to sleep, food to eat.
I personnaly have enough of that in real life.