lol, are you talking about Lucy Liu's character in Kill Bill? Iirc, her character, Oren, in that movie was Japanese/Chinese/American. So they got some of the genetics right in casting her.
I agree with you that Zhang Ziyi and Michelle Yeoh are more "martial arts" style divas but, then again, I suppose it doesn't hurt for them to attempt to break out of that mold. Still, I think that they should've casted Japanese actresses in the role. Although I haven't seen the movie yet, I wonder if they understood all the nuances as well.
Stephanie
In every man there is something wherein I may learn of him, and in that I am his pupil.--Ralph Waldo Emerson