I am forced by facts to strongly disagree. Although much of government has a life of its own, and the president usually has comparatively little influence except through his choice of Department Heads, there are some areas of government the President affects profoundly and directly. Here is a quote from Goldberg's detailed article in the Atlantic Monthly:
[Obama] has, late in his presidency, accumulated a set of potentially historic foreign-policy achievements—controversial, provisional achievements, to be sure, but achievements nonetheless: the opening to Cuba, the Paris climate-change accord, the Trans-Pacific Partnership trade agreement, and, of course, the Iran nuclear deal. These he accomplished despite his growing sense that larger forces—the riptide of tribal feeling in a world that should have already shed its atavism; the resilience of small men who rule large countries in ways contrary to their own best interests; the persistence of fear as a governing human emotion—frequently conspire against the best of America’s intentions. But he also has come to learn, he told me, that very little is accomplished in international affairs without U.S. leadership.
Whether we agree or disagree with the President's decisions in these matters, we can not truthfully say he has not gotten things done! Please read the entire Goldberg article. You will discover other remarkable achievements of this president.
http://www.theatlantic.com/magazine/archive/2016/04/the-obama-doctrine/471525/