Actually here is the dealio.
Western games have crappy stories, but great unfolding of the narrative (Uncharted, Mass Effect, Dragon Age, etc...), meaning the way the story is told adds in the strengths. Think about it for a minute, Mass Effects story is pretty 'eh eh eh?' at best, yet the way it's told, and how all the world is held together is what adds the strength to it.
On the other hand, the Eastern games have more 'varied' themes of a game's story, but they lack the ability of make the narrative worth two craps. Take for example Knights Contract:
An evil Lord goes on a Witch purge, and decided to kill a clan of Witches which wants to help common people, yet the people get riled against them because of the Evil Lord manipulations. The guys who is tasked as the one to kill the Witches doesn't want to see the truth and accepts what is happening due to his own fear being outcast from society.
So a Witch curses him to be immortal, making him into something he feared he would be looked down upon as.
The Witches which are killed all come back to life, and are monsters (variations of 7 sins) and now want to destroy humans, but one of their sisters with the main character have to stop them.
However, the game isn't worth two crap in the story department because everything is drawn out so badly, it's not funny. The Witches all talk in a voice of boredom, the pacing is horrible with dialog that sounds...off, the events are employed at random (in one scene, the characters have the chance to fight the evil lord, but they say 'it's not now the time', and later on are in some other even that cannot even relate to the previous event). Lack of proper narrative, muddy progression and lack of coherent plot settings.
So yeah, if only Western and Eastern game developers actually joined forced, then maybe we could something that is worth two craps.