A 2010 Siena poll of 238 Presidential scholars found that former president George W. Bush was ranked 39th out of 43, with poor ratings in handling of the economy, communication, ability to compromise, foreign policy accomplishments, and intelligence. Meanwhile, the current president, Barack Obama was ranked 15th out of 43, with high ratings for imagination, communication ability and intelligence and a low rating for background (family, education and experience).
The C-SPAN Survey of Presidential Leadership consists of rankings from a group of presidential historians and "professional observers of the presidency" who ranked presidents in a number of categories initially in 2000 and more recently in 2009. With some minor variation, both surveys found that historians consider Abraham Lincoln, George Washington, and Franklin D. Roosevelt the three best presidents by a wide margin and William Henry Harrison (to a lesser extent), Warren G. Harding, Andrew Johnson, Franklin Pierce, George W. Bush and James Buchanan the worst.
In 2008, The Times newspaper asked eight of its own "top international and political commentators" to rank all 42 US presidents "...in order of greatness".
In 2011, through the agency of its United States Presidency Centre (USPC), the Institute for the Study of the Americas (located in the University of London’s School of Advanced Study) released the first ever U.K. academic survey to rate U.S. presidents. This polled the opinion of British specialists in American history and politics to assess presidential performance. They also gave an interim assessment of Barack Obama, but his unfinished presidency was not included in the survey (had he been included, he would have attained eighth place overall).
In 2012, Newsweek magazine asked a panel of historians to rank the ten best presidents since 1900. The results showed that historians had ranked Franklin D. Roosevelt, Theodore Roosevelt, Lyndon Johnson, Woodrow Wilson, Harry Truman, John F. Kennedy, Dwight Eisenhower, Bill Clinton, Ronald Reagan and Barack Obama as the best since that year.
A 2013 History News Network poll of 203 American historians, when asked to rate Barack Obama's presidency on an A–F scale, gave him a B- grade. Obama, whom historians graded using 15 separate measures plus an overall grade, was rated most highly in the categories of communication ability, integrity, and crisis management, and most poorly for his relationship with Congress and transparency and accountability.
Other findings in "Historial Rankings Of The Presidents Of The United States" can be viewed at http://en.wikipedia.org/wiki/Historical_rankings_of_Presidents_of_the_United_States
Here's the videotape of Dubyah's "victory salute" to the American people: https://www.youtube.com/watch?v=D0IJkD0znCQ
Pass the K-Y and spread those cheeks.