I agree that the story progression needs heavy refining. All that ever seems to happen in my town is people moving. I've had a few marriages, and a few births (and lately we're getting lots of deaths from old age) but otherwise, it's all moving. I haven't kept track of who's moving where, but it seems from this thread, that the moving isn't even logical. I could understand if a family of five moved from a two bedroom house to a four bedroom house, but moving to a smaller location just seems stupid! And I'd rather see the same families stick around rather than a steady stream of families moving away and new ones moving in!
But mostly I'd like to see more marriages and babies. I created a bunch of families for my town that I never intended to play--I just wanted to watch them grow. But my married couples never had babies and my single Sims didn't get married, not even the hopeless romantic and flirty ones. One flirty Sim married, but she and her husband never had kids! And my workaholic/ambitious Sims didn't work up their career ladder, which I also thought would have been a nice touch. Essentially, there doesn't seem to be a whole lot of motivation in non-active households.... except, of course, to move!
That said, I've got one household of seven adults which never changed, despite the house being far too small for them.