I think Obama was a good president but I dont really think compared to the past president he holds up that well.
If a decent man is sandwiche between crap and more crap (Bush and Trump), it will be default make you look good.
Personally, I think he is better then Clinton has he turned more progressive as he stayed in power but I would rank him below Ronald Reagan. Why?
Well I am not a big fan of Reagan policies, he did unlike Obama really transform the nation into his vision and really have a big effect on world politics with ending communism and ofcourse his very personable style as well.