Jimmy Carter was good.
As far as presidents go, he was the only former president to go on doing good across his entire life. All of his work for Habitat for Humanity, for sanitation all over Africa, etc., are things he did because he had been president, and should be included in his record. Not a single other former president has done so much as an informal American ambassador of good will.
And as for his time in office, he was prescient, telling us decades in advance what issues we had to address for the future, and he was not wrong. During that period, he was able to broker at least a temporary Mid-East peace, and the fact that no later president could make it less temporary is not at all his fault.
Ronald Reagan made the rich and upper middle class richer by the same amount that the poor and working class became poorer, and he is responsible for the initial growth of the evil anti-abortion movement, which has now been responsible for victimizing many women. While he was in his second term, Nancy ran the country, because Reagan had Alzheimer's - talk about unfit for office.