Whether or not this means doctors educated in the US are superior and make fewer mistakes than those that are not, I do not know.
The intern year is pure hell everywhere as far as I know but that's after you graduate even you want to qualify as a doctor. A year when working a mere 60 hours basically qualifies as a week off and people commiserate over the length of time they've gone without sleep.
All that said outside surgery the hours appear to be mostly hazing. Between lessened fatigue and poorer continuity of care reducing doctors' hours is a wash when analysing fatalities and medical errors. This does not hold for surgery. Reducing intern's working hours clearly results in more patient deaths in surgery. Feel free to check on google scholar.
After that statement, I'll assume you don't know what you're talking about or you're in some odd part of the planet where nursing is taught on the job.
Around here, nursing requires years of training. Psych, biology, pharmacology and I don't know what. We have different level of nursing qualifications, with the longest being a nurse practitioner, capable of legally prescribing medication.
It is a field regulated by the same governing body as doctors, and is not trivial in any way.