Base game only is still pretty empty, gameplay wise, though if you've not played since 2014 there have been updates, such as toddlers being added, wants and fears, lot traits, things like that, which help a little. It is still very bland though.
Though I will say, the capabilities of house building in the base game has improved immensely since 2014, there's been a whole load of improvements and additions like basements, platforms, ponds, etc. It is a very nicely intuitive and easy to use building system, if that's your jam. Otherwise...maybe not.