Here is his legacy

Obama leaves office
Republican president, Trump
Republicans control Senate and House of Representatives

because of Obama's poor job as weak president

56% approval rating, Gallup poll, as he exits
not spectacular

Since he became president the Democrats lost over 1,000 federal and state elections

he campaigned for Hilary (as did Michelle) so her failure is also part of his legacy
in rejecting Hilary the voters rejected Obama
this is his legacy