Each generation has its own videos, music, art, books and whatnot, to define it.
With modern society, games have started to become more of a culture and attraction than anything in the past. Anymore, a good game can easily compete, if not outsell, novels and cinematic bigscreen movies.
They are no longer animated-pixel "toys" to the modern world, and can tell a tale and show a world just as vast and creative as those in a movie or book.
And for a game like Grand Theft Auto 4, it not only disproves games are just for nerdy gamers, but its not much of a game at all, as it is a work of art. Quite simply, its the most stunning rendition of reality and the modern world in the face of crimes, gangs, and dilluted dreams of the "land of the free". As soon as you start the game, you will notice the character, Nikko, is alive, and the world around you breathes and moves like a typical stroll down a major city or coastline.
I could go on and on into detail, missions, control, story, but whats the point? It's so perfected, that nothing needs to be said other than "How did they do it?". It's literally breathtaking and awe-inspiring.
I've played 5 hours of it since yesterday, but I can can stand here and produly proclaim that this game is going to be the game that defines this era.
I used to beleive it was the original 1993 id software release DOOM that defined everything for the gaming community, and open up gateways for infinite possibilities for generations to come, but where as it changed the way we perceived and would play games, and what could be permitted in them, Grand Theft Auto 4 redefines by adding life to a game, the ability to step into your character and everything becomes suddenly aware as if you were there yourself.
Do yourself a favor, buy this game. And if you dont have a console to play it on, buy one, and experience it for yourself.