I tend to strongly agree that amongst all medical specialties, psychiatry is the worst for global medicine. I COULD see it, possibly, if you have an amazingly personal close tie to a given culture or if where you trained is extraordinarily similar to where you practice, ie UK trained going to Australia, but even then, it's going to be a much bigger challenge than other specialties. Culture is like the air we breathe, it's not something that you are often even aware of and honestly, treating mental illness is probably not an ideal place to be learning it for the patient or provider.