I went insane and got Cities: Skylines, because I've been craving an updated city builder since Simcity 5 was announced...and the disastrous disappointment of that release really let me down.
I only had about an hour to play last night before I was called into action for domestic duties, but my first impression is that the game is fucking hard... Which is great. It seems very well balanced. You can't rush anything here, because you'll pay for it in the long run. You simply must start out on the village level and build slowly, evenly, calmly... It's easy to zoom up to 1000 people within a few minutes, but that backfired on me catastrophically.
The details are amazing... Traffic is fucked if you build industry along the highway -- trucks need to stop, and they'll tie up traffic when they do so. Traffic jams have a sort of accordion effect, too. Very cool, very well thought out.
Managing services -- water, trash, power, emergency personal -- is well laid out, and also enjoyably difficult. It's again set up to control and check your expansion. You can't go and paint a whole swath of zones as residential because people will move in randomly and then you'll be stuck with having to quickly expand your services (adjacent zones feed each other, in terms of power, so there's no need to build a zillion powerlines unless you overstep your expansion).
Trash pickup and emergency services can get screwed by traffic. If there are slow roads and ambulances can't get to sick areas, then the sickness may spread. Same with fires. Everything is sort of working together -- water has directional flow, so you have to be careful where your sewage outflow is going. You have to pay attention to your surrounding zones -- will a reasonable spot for sewage outflow totally destroy an adjacent zone that you may eventually want to expand into?
I didn't get far enough to have worries about governance, pollution, education, etc... But it's all very cool. The Simcity we deserved!