You could almost say that freeing the slaves was an after-thought.
In the Process, he violated the Constitution and Bill of Rights:
He declared war as President (When that power was reserved to the Congress), set up a blockade of the South (again, without Congress), imposed martial law upon civilians and confiscated property. So I would argue for his being one of the all time worst presidents.
"Hence, naturally enough, my symbol for Hell is something like the bureaucracy of a police state or the office of a thoroughly nasty business concern." ~~C.S. Lewis
Love won! Deliverance from Tyranny is on the way! Col. 2:13-15