We've seen a sort of vindication of the Bush administration in recent years. The idealistic, hopeful civil libertarian Barack Obama took office, sat down for an intelligence briefing, and, after hearing what he did, flip flopped on virtually every major civil liberties and foreign policy position. President Obama expanded W's faith-based initiative. Thanks to Bush-era intelligence, President Obama got to walk out in front of the cameras and declare Osama bin Laden was dead.
Bush basically gave up on efforts to get Osama. Obama had to restart these efforts from the scratch.
Bush administration is largely responsible for the mess in the Middle East to begin with.