"Besides, the standards of oral English that some Americans produce indicates that they are in urgent need of some remedial ESL training as well - even after making allowances for the deficiencies in American English."
Breconian

Please explain further what you mean by the deficiencies in American English. Try to keep it simple, though, will you? After all, being an American, you may have to spell it out for me.

Other than the above, by the way, your post is unworthy of a response in that it is based on an obvious prejudice coupled with ethnocentrism; moreover, it is quite apparent that your exposure to the EFL environment in China has been quite limited - as has been your exposure to American English. I would suggest a little more maturity in the way you view the various Englishes of the world, and a little more growing up in general wouldn't hurt either.