He was a big government Republican but at least his foreign policy was not a disaster.
I agree with your ranking with the exception of Nixon. Despite his flaws I would rank him above Carter
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When you look at Hoover, Bush II, Carter, Lyndon Johnson, Wilson, and Nixon there are relative degrees of awfulness that could be seriously debated. That said, I ranked Nixon so low because he led to Carter and because he resigned in disgrace (damned quitter), in addition to screwing up things in his own right. Funny that the Left hated Nixon so much when his policies were so big government and controlling.
Obama and Roosevelt are in a class by themselves in my opinion because of their extending the pain of depression for the entire country.