[U.S.] Suburbs become unpalatable once you live somewhere that actually cares about public transit and designed the city accordingly. E.g. Seoul. With mixed residential and commercial businesses, one never has to walk more than 5 minutes to get groceries, if that. Trains and busses will take you anywhere you want. Of course, you can still have a car, but it simply is obviated unless you have a specific need to move furniture, etc.
After having experienced that, I absolutely detest having to hop in my car to drive and get groceries, etc, because there is -nothing- but houses in my suburb area. It makes me rather depressed knowing what people are missing out on, what life is capable of being like. A well-run, comprehensive train and bus system like that will probably never happen in the US.
edit: I am speaking specifically about suburbs in the US. I don't think other countries design suburbs nearly as car-centric and isolated as the U.S. does.