Kojima's stroke of genius was making games that were paced like movies, the emotional ups and downs and nail biting suspense of a movie, story telling in games never captured such a cinematic feel prior to the original Metal Gear Solid.
It's kind of insane how forward thinking Kojima is, the original Metal Gear Solid stands out so much from any other game in the late 90s, then the mother fucker managed to predict present day society in 2001 with 2, then you have the survival elements in 3, think of how many "survival" games there are around today, the dude is almost always one step ahead of everyone on where games are going.