In my opinion the fact that the gangs blend in with the rest of the population makes the game more interesting. Now, you have to choose your random violence more carefully or you end up on the business end of a gangland shootout. The street gangs of SA were ok (I guess) for the purpose it served to illustrate the gang culture of California (San Andreas) and the importance of colors. The gangs from the III and Vice City in retrospect, were very simplistic and not that realistic. There are many gang members that walk around and you wouldn't know they're in a gang. They do not always advertise affiliation through clothing.