Moth3r said:
I'm not a huge fan of Godzilla films, but I thought the premise is always that the monster attacks real cities (originally Tokyo, Osaka, etc.)
If you're going to depict a fictional city with buildings that defy the laws of physics, you may as well have it attack Gotham City or Springfield.
See also: http://en.wikipedia.org/wiki/Suspension_of_disbelief
Godzilla films have always favored the fantastical to the realistic. Do the sounds and fire in outer space bother you in Star Wars? It's a fantasy film, not a documentary.