>>718030517
The bulk of the fun comes from the random challenges it throws at you, and the inevitable ones that arise from an increased population.
If you played 4 hours, you probably got some Migrants, and had to accommodate them. But with more dwarves and more time, that leads to more interactions between them, which weaves a lattice of relationships that can lead to a Tantrum Spiral.
But you probably didn't get any Forgotten Beasts or Hill Titans or Dragons or Sieges.