I've lived in Korea for ten years, and speak the language. This thread is assuming that Koreans are some sort of gaming-fanatics. Yes, there is a television channel featuring Starcraft and other games. Yes, there are "cybercafes" where you pay one dollar an hour for access to all the latest (Korean) games. Does that lead to social problems and gaming centered communities? Sure. That doesn't mean that everyone and their dog is completely batshit insane about Starcraft or one of those mindless click-fest MMOs that get released bi-weekly.
Korea is a very small country. If you're well to do, you might live in a two room apartment complex. Families often all sleep in the same room, and share space in almost every way. So you can imagine that it's not uncommon for teenagers and college age students to want to get out of the house. Aside from the "PC bang" (pronounced bahng, means room) there are many other sorts of places young people can go to escape in relative comfort. A PC bang is a workstation with a comfortable chair, often in reach of a soda cabinet and snacks. These computers are usually lanned up to each other. Some are very comfortable (sometimes more comfortable than home), others are smoke filled basements. I've been to PC Bangs with full service cafes and chairs so that young lovers can sit together while they play Audition (think DDR online). PC bangs are however only a very small part of a nighttime entertainment industry aimed at young Koreans. The Karaokes (No-rae bang) litter every city block. Nightclubs downtown are nearly as prolific, and the amount of liquor establishments around college areas would blow your mind (trippy man!).I don't need to tell you that Koreans are well balanced when it comes to entertainment.
Most of the reason people like to pick on Korea for being a country of unwashed game nerds is that Korea was developing very quickly and until recently hasn't really bothered with world opinion. Most people know about as much about South Korea as I do about Madagascar (it's an island right?). Fifty years ago the place I am typing this from was a pile of rubble. That's quite the achievement for a once third world nation.
The same people who claim Korea is a nation of super gamers are the same people who call Americans "fat rednecks", Canadians "Eskimos", Irish "drunks", and New Zealanders "sheep humpers" (though to be fair my Kiwi roommate DID have a sheep calendar on his wall). It's a convenient comparison when trying to be funny, but it has about as much basis in reality as assuming all Germans are Nazis.
Typical Korean Street (near a university)
http://bp0.blogger.com/_6lwN5DOxeJ8/R7if3iyc8zI/AAAAAAAAAOA/sBmbmYvfpZo/s1600-h/DSC00470.JPG