Here in the Czech Republic, there is no forced smile. It is not a part of the culture, people generally don't do it, and people here generally see americans (especially americans) as fake, superficial, and insincere.
I'm a bit on the fence about it. Central Europeans, including Czechs are a rather gloomy bunch :-) especially in the winter. Americans are definitely more cheerful, and it is not fake. Ok, sometimes it is but generally speaking Americans are in fact more cheerful and optimistic. Ok, Czechs have five centuries of being conquered and subjugated of course, so let's not draw too many conclusions.
In terms of smiling strangers, well, I'd like a bit more of it than we have here in the Czech Republic (where there is very little)
I'm a bit on the fence about it. Central Europeans, including Czechs are a rather gloomy bunch :-) especially in the winter. Americans are definitely more cheerful, and it is not fake. Ok, sometimes it is but generally speaking Americans are in fact more cheerful and optimistic. Ok, Czechs have five centuries of being conquered and subjugated of course, so let's not draw too many conclusions.
In terms of smiling strangers, well, I'd like a bit more of it than we have here in the Czech Republic (where there is very little)