Right from the start, Obama's problem was that he was an ideologue who pushed ahead with policies that made the leftist elites happy, but turned off the regular  working people of America. He knew best. 
He started off his presidency by running off to Egypt in order to bow down and prostrate himself to Muslim states, many of whom  held the USA in disdain, distrust and disgust. (And still do). He then proceeded to further alienate the ordinary working person by ramming through unpopular socialist policies on so called "green initiatives" and unwanted social healthcare. He made the USA further dependant on energy from hostile nations by rejecting the keystone pipeline. (all in the name of the ridiculous notion of anthropomorphic climate change. ) He alienated America's most useful ally Israel by swooning about the "settlements", as if that made any kind of difference in the real world. 
All in all his legacy is that of an out of touch complete failure. Good riddance.