This feels like a troll comment, in that it asks a back-handed question, to highlight the shortcomings of a comparable example, more than the question voices honest curiosity regarding the question as it may be superficially posed. Possibly in an effort to lead the loaded question down a negative path, such that responses will lend voice to an opinion one might read between the lines.
But first and foremost, no one from New York calls it “NYC Metro.” It’s The Subway, and it’s operated by the MTA. So, already your comment has the ring of someone who doesn’t live in New York. And to go one deeper, The Subway hasn’t smelled like that since the mid 1990’s. Most of the tourist stations “Disney-fied” by Giuliani get power washed every single night, after midnight, during the gravyard shift, to eliminate the smells of humanity.
It’s still very old, very dirty, very inefficient, slow, crowded, and peppered with tourists, homeless people, pickpockets and weirdos all at once.
New York has more going on than many other cities, and is as dense as it is diverse, and it’s been that way for at least 100 years (or at least the subway has), and that’s a somewhat conservative time frame, but
Other cities aren’t like that, and some of it is due to strict policing. Not always though. Some of it has to do with climate, sunlight and weather, or in social terms, the implicit understanding of the expectation of one’s peers.
In lively cities, when transplanted people lose a sense of expected behavior among strangers, behavior loosens up. Some cities have a specific reputation as being a destination for the specific reason to either lose or find one’s sense of self. New York is one of those places.