Here in Massachusetts, I'd say there are not many playgrounds in suburbs at all. There are many very nice playgrounds in (certain) cities. I've always assumed that suburbs don't care as much about playgrounds and parks because most houses have a (large) yard already.

On the whole, suburbs also have nicer libraries, though there are examples to the contrary - e.g. Cambridge, MA has a really fantastic main library.

The quality of libraries and schools mostly tracks how wealthy the suburb/city is.

I agree with you that no matter how wealthy the suburb, food, entertainment and public transportation are going to be seriously underwhelming compared to a city.