Ok Candycorn. I finally have nothing better to do than respond to your question. First, I said GWB was "middle of the pack". I don't need to place him exactly, smack dab, in the middle. I will split it into 3rds. the bottom third, the middle third, and the top third. If GWB is in the middle third he is "middle of the pack".
Second, your terms are unacceptable and show your lack of understanding about American history and civics. How a president leaves the nation is not always a correct way to measure his effectiveness. In fact, usually it isn't. This is because certain things happen that are beyond a president's control. I am assuming you refer to the economic collapse at the end of Bush's term. If you think that was Bush's fault, you really need to brush up on your history and your understanding of the way the government works. The president does not control the economy. That is all on Congress and the Fed. There is not a single thing any president of any party can do about the economy unless Congress cooperates. If you can't grasp that, sue your high school civics teacher.
So...presidents that were worse than GWB (or at least less effective) in no particular order: John Quincy Adams, Andrew Jackson, Martin Van Buren, William Henry Harrison, John Tyler, Zachary Taylor, Millard Fillmore, Franklin Pierce, James Buchanan, Andrew Johnson, Rutherford B. Hayes, James Garfield, Benjamin Harrison, Warren Harding, Herbert Hoover, John F. Kennedy, Lyndon B. Johnson, Jimmy Carter, and Barack Obama.
That's 19 which puts him very comfortably in the middle of the pack. But arguments could be made about Thomas Jefferson and John Adams, both of whom were fantastic men who inspired revolution, but frankly, pretty lousy presidents.
Now my guess is that you might recognize about 6 of those names, so go take a history class and learn about your country.