Yeah, Andrew Jackson was underrated.The Federal Reserve put him on the $20 basically to say they were victorious and to rub his nose in it post-humously.Most of the early presidents were good, they had their heart in the right place which is more than what you can say for any president after 1963.
The worst president was Woodrow Wilson, for allowing the federal Reserve Bank to take control of the money supply in the first place in 1914 with that dodgy vote when most members were on Christmas leave.His league of nations was an early attempt at creating a world government.Basically he was a puppet that was in way over his head.
Second worst : Nixon for abandoning Bretton-Woods.We'd have alot less US military involvement overseas if that system was still in place, which is of course why they removed it.
Third worst Clinton/Bush Jr tie.Clinton for abolishing the Glass-Steagal act which is basically what caused the 2007-08 financial collapse, bringing in the DMCA, was it him that brought in NAFTA? The guy did ALOT of damage.Bush Jr for starting the Afghanistan/Iraq wars, increasing the debt by an astronomical amount, PATROIT act, Homeland Security, terrible president.