Undoubtedly, Obamas first two years were his best. Obamacare, Stimulus, DADT repeal, START treaty. But he had a Democratic Congress and a short term super majority
When Republicans took Congress, they taunted Obama as a lame duck. Republicans are now calling the shots and Obama is Mr Irrelevant
But Obama kicked it into gear. Immigration reform, recognition of Cuba, Iran nuclear agreement, trade and environmental agreements with China. The courts backed him on Obamacare and same sex marriage......all with a Republican Congress
In the absence of leadership in Congress, Obama has substituted leadership from the White House