Too many things to list...
I miss the Zodiac and how it affected relationships like in Sims 2
Turn ons and offs from Sims 2
CASt and the Color Wheel
Many of the build tools from Sims 2 and 3 (like the Terrain tools and the foundations for different buildings)
Create a World (or using Sims City 4 for Sims 2 which was brilliant!)
Being able to edit existing worlds like changing lot sizes or add more lots/community lots.
Family trees that actually worked (see Sims 2 and 3)
Being able to do a bit more with families
Teens that were teens not Young adults that pretend to be YA.
That's all I can think of for now.
