The sword vs guns is simply cultural difference in the philosophy of war. Its basically because the USA warrior culture is born from the gun and the rest of the worlds older countries' warrior culture is born from the sword.
Actually, it is more a thing of how a weapon is percieved. The US (along with most of the West) see the weapon as a tool, a thing that a warrior needs in order to be successful, which is why a lot of Western myths, games, films contain warriors that use Magical Swords That Cannot be Defeated
tm in order to slay their foes. To put it simply, in western culture,
strength derives from the tool.
In most Eastern mythologies (and by eastern mythologies, I mean the far East, China, Korea, Japan, et cetera), the power of the warrior comes from within, and their weapon is merely an extension of themselves, which is why in a lot of eastern games, characters can shoot fireballs et cetera (not by use of magic, mind you, "use" of magic (as a tool) is a western thing, in Eastern myths, magic comes from within). Put simply, in eastern culture,
strength comes from within.
So, despite the fact that the Japanese were
very partial to using firearms during their feudal period and despite that all eastern armies use firearms nowadays (ergo, the "philosophy of war" is partial to firearms, like in the West), the reason why eastern games contain dudes wielding swords fighting off hordes of gun-toting maniacs isn't the difference in the philosophy of war, it's a difference in how a weapon is percieved.
In eastern games, a well trained warrior can defeat said hordes of gun-toting maniacs not because his sword is better than their guns, but because he is a better warrior. Still, I preffer the realistic presentation more since there's no way in hell, even if your sword is enchanted (unless it's enchanted with Killing Your Enemies From Afar
tm (might as well invest in a gun, really) or Blocking All Projectiles
tm (Physics would like to have a word with you) that you're ever going to beat a guy with an AK-47 except in some very specific circumstances (but said specific circumstances do not neccesarily require a sword as any melee weapon would do)