Number of things.
1) can't find a server even though my internet is fine.
2) exits my city when i leave it for 10minutes or more and takes me back to main menu.
3) can't share resources with myself or if i have unlocked detective wing in one city it's not unlocked in my other.
4) can't get rid of ground polution under road.
5) MAPS ARE WAY TO SMALL.
6) can't connect powerlines to other cities(for an example) as advertised on your trailer plus a number of other things.
7) Why can't we at least be able to increase our boarders by buying them with solimens (if that is how you spell it)