Tose who are putting Obama in their list should really explain their rationale
Start with the fact that he was a two-term president who left office with a 60 percent approval rating; that alone puts him in the top half of presidents to start the analysis. He also passed the first major healthcare bill since the 1960s, passed another major legislative priority (Dodd-Frank), appointed two Supreme Court justices (who seem to have largely ruled in a way that he approves of), avoided major scandals, handled foreign policy crises reasonably well, and left office with a booming economy after inheriting the Great Recession from Bush. And Obama did all that despite holding office in a polarized environment in which the Republican Senate leader explicitly admitted that his chief goal was to make Obama a one-term president. Obama is clearly not in the top tier of presidents, but it's hard for me to see his presidency as anything other than a success, and
most historians agree.