It's different, but not bad. I've learned a bit in the past few years about regional planning from someone with a Ph.D. in the field. What's cool is that this SimCity includes so many aspects of how regional planning works. Cities don't exist in a vacuum, so even if the cities are a little smaller in this version, the game is more rich because it includes regional scale planning!
If you like rally and you like sim-like racers, this game is actually quite good. The physics are fairly good: decently realistic, never too frustrating, and quite rewarding when you get it right. It's fun to go from tarmac to gravel and "feel" the difference. I wish it had longer stages and more of them, but whatever. I got Dirt 3 and this at the same time and I'm spending much more time on this. You can sit down, spend 35 minutes and do an entire rally of 7 stages, which is pretty enjoyable.