I don't see at what time they tried to cater to teens, outside the parodying themes of that generation which they fit perfectly. I saw that every installment representative of a criminal from one of these cultures to top of the criminal food chain. Be it the Scar Face parody of Vice City, Gang culture of San Andreas, the Immegrant story of the 4th or the trio they went for with the 5 with the LA story melting pot.
As a none-american it perfectly represented the characters and views of over the top depictions of the movie version of these places.