First of all Metropolis doesn't have that flare so it would never work as a title... it just doesn't have that vibe... take for example Los Angeles... that would never work as a movie title... and Metropolis is a similar counterpart... now just say they were making a movie about New York City back in the 80's when it was one of the most dangerous cities... a gang movie titled New York City would give you that vibe cause you know what the city was associated with... even Chicago, a real movie title that worked (won best picture no?) because it gave you that vibe... I will admit TDK Rising is the best title I have seen involving TDK "Adjective"... but Gotham City gives you that vibe... when someone says Gotham City you don't just think Batman... you think of the Joker, a city jammed with mobsters and degenerates... you get that Gothic feel (something BB didn't touch on but its still there based on other depictions)... it just shows how the city has evolved over the course of three movies... if they made a movie about New York City and how Mayor Rudy and the police cleaned it up in less than a decade... that title could have worked... when you say Metropolis... you think Superman, Lois, and the Daily Planet... it really doesn't do anything