Asian men suffer from two things: lack of confidence and they tend to be the stalker types. I know one guy in town who wants a white gf very badly. Instead of meeting them and then getting to know them, he gets their phone number somehow and calls them out of the blue. He did this to one American teacher in town after he managed to get her hotel room number. He later called her while she was in her room without introducing himself. You got a freaked out woman who did not respond positively. I knew another Chinese guy who told his Dutch gf that he would kill himself if she left him.
Another is self-confidence. The way things are going economically in the USA, I feel American woman will be using Chinese men to live and stay in China.
I have seen Asian men and western women couples out there.