I agree pretty much with everybodies lists, plus..
I guess my wish would be more randomness on each lot. Dunno....
natural disasters, I want to see earthquakes, hurricanes, flooding...
hoodlum teens stealing stuff,
realistic police interactions,
neighbors that are annoying and complain about your landscaping,
phonecalls from bill collectors
I want to have the choice of going to work with my sim and micromanaging his career.
I think that would be fun specially criminal career...
I think community services should have playable lots such as firestation, police dept, jail,hospital with maternity ward and normal childbirth that doesn't come out from above my sims head.