Nixon was actually a terrible President: he willingly played an active role in establishing the EPA, he eliminated the gold standard for good, and he had plans to push a socialized medicine plan through Congress.
Eisenhower should also be viewed with skepticism, especially since his first political act was to destroy the career of Robert Taft. I understand that he regretted appointing Earl Warren to the court, bur even if that is the case I am not willing to forgive his gross lapse in judgment.
Getting in bed with Communist China was the worst mistake ever.