Japanese are good in making good RPGs

Final Fantasy series
Shining series
Dragon Quest series

Are the Japanese really creative or the Americans are just lack the skills in a good RPG plot?

On the other hand, it's hard for nonlinear PC games to have dramatic plot and character development with so much nonlinear freedom, NPC death, character customability, etc.  Bioware does a good job, but your main character still isn't defined much except for being the The Hero or The Guy Who Thought He Was The Hero.