As most big countries it's hard to say something exact about doctors in Brazil, so I'll just tell about my region (southern part).
As already said before, you can't rely in public health system, but if you have a health plan (I do) the situation is much better, but as usual there are good and bad doctors.
Most I ever meet are nice and very talkative (brazilian people mostly like to talk adn have human contact), even the ones not very nice I've met always answer all your questions, but you have to question them, other... (
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