Not to be offensive, but I've heard the Sims described as a virtual dollhouse. A description I wholeheartedly disagree with. I think this belies the depth of the game.
Dear one, that's because you never played with doll houses! They become quite real and very, very Simish to those of us who have played with them.
I'm an elderly female raising the last of a bunch of kids. I've always wanted lots of kids and in rl I achieved that LTW. I also wanted to be a famous actress, archaeologist, artist and writer. Total fail at that, lol! I also love gardening and fishing in rl and so my Sims often are gardeners and anglers. I would so love in rl to live the life of the rich and famous, or anyway the very vulgarly rich, but alas, it is the ear wax flavor of every flavor beans for me. Not total poverty mind you, but definitely not able to use $$ as tp if I so wished. So I like to take my Sims from total homelessness, (ok, they maybe own a plot of land), to a faboo mansion in several lands. My Sims love to travel and so do I, but I'm physically unable to do so, so they travel for me. I'd like to be young and gorgeous, so my Sims usually are, and oh, do I hate it when they age up! (And I hate even more that EA has made aging a hunchbacked, lip smacking, big nosed, uglifier in bad clothes! Old folks are not all like that anymore!)
I voted that I like to play with families, but really I like to play both ways. The only thing I don't generally play is a male character, except for the spouse or son of my created female character. I just can't get into the whole male psyche so really don't know how they would act as a Sim. I like taking a single female and bring her up to full, feminine glory. Rich, gorgeous, has a great life and even manages to catch her man/men and sometimes progresses to being a mom, but not always.
When I do play as a family I am totally enamored of the nooboos. The toddler stage is my all time favorite and I hate it when they have to age up. When I'm not playing a legacy or dynasty, or some challenge, my Sims have very long lifetimes and very slow aging so I can enjoy my toddlers longer. They are just so adorable!
And my all time favorite way to play is no Sim at all. Just build and build and build.