Bush II will be in the bottom 10, most likely, Obama, in the middle. Reagan was the worst of my lifetime....until Bush II. I was very young, see now he inspired some, not my parents by any means, and my mother had been a Republican, until Reagan. Nixon, probably the best, in hindsight. Historians rank Buchanan, and Pierce as the worst, usually. A little thing called the Civil War hurt them. Carter was fairly good actually, the Reagan grin makes many forget those 21% interest rates were during his first term, and the deficit went through the roof, courtesy of Reagan. But he did act folksy while Nancy spent hundreds of thousands a year on designer clothes. Reagan talked of being an "old cavalry man", avoided WWII by making training films.

He wasn't real bright, but even a Z grade actor*, can pose well enough in the TV age.
*My father's term for Reagan. He despised him, remembered movie magazines dropped on his ship during WWII, Reagan relaxing at Delmonico's, while teenagers like my father fought the war.