To be fair, it's not about being Western of Eastern. Most japanese studios are creating playable anime, with all their own set of clichès. Creative people are rare everywhere in the world. The West also has Double Fine, Media Molecule, Irrational Games, ThatGameCompany, etc.
I even think it's not a matter of lack of creativity. Its lack of taste. Give a person with a shallow repertoir and mundane world views a greencard to go wild and crazy, and off the beaten path, and they come up with stuff that doesn't feel right or hold together. It takes a lot of artistic finesse to step outside of tried and true formulas and create your own that is still solid and coherent.
Let's not forget Kojima's first games were very much playable Michael Bay movies with just a sparkle of anime/manga scifi-fantasy sparkled on top, so... there's all that...