Heard CitiesXL was also pretty buggy, particularly the fact that the game broke once you got a certain amount of high population.
Thankfully, there's still SimCity4 to be played if all goes not well. I feel that despite being literally a decade old, SimCity4 has aged ridiculously well and still looks phenomenal today - and I mean really phenomenal, enough that if they made SimCity 4 today I wouldn't have thought of the graphics as outdated in anyway whatsoever. To be honest I think SimCity 4 looks better than the new one, which looks a tad cartoony.