Yes, I've played sim city 4 quite a bit on my 2.0 MacBook. It plays beautifully, much much faster than my 800mhz TiBook of course. It's smooth to zoom in and out. It's not as fast as Doom 3, but it's rosetta , so that's understandable.
However, it's really fun to play on this much fast machine. And I have some pretty complex cities that have a lot going on. Also, I leave the detail pretty high.