it's not easy to be a doctor in the US, good acdemic work is only part of the requirements, there are many other requirements.
maturity, mental condition, communication skill....etc. are all the requirements.
most doctors in the US are over-worked.
most doctors(80%) are in debt of about US $250,000. - $300,000. before they start making money.
the training of US doctors is best in the world and they will all make a good living because the number is limited, for the past 30 years the number remains about the same.