Stephen Walt sounds off in his Foreign Policy blog about the many complaints about Obama that come from various locations on the political spectrum. He argues that many forces are simply beyond Obama's—and implicitly—any president's control. A bloated military, foreign policy inertia, vested interests of elites, client states, and so on, make changing policy very difficult. The electorate wants to change policy and outcomes as quickly as a motor boat wheels around on a large quiet lake, while in reality, changing American policy is more like trying to guide the Titanic through North Atlantic waters—you just can't often make turns quickly enough.
The more I read Walt, the more that I like him. He seems to have his head on straight.