Lincoln is also unique among presidents. Lincoln's civil rights record is bad, but he was in a civil war and made bad decisions under extreme pressure. He held the country together and you can ask at what price. But, Lincoln was in control of his administration facing situations not faced before by earlier presidents.

Bush is not in a civil war and has done material damage to America's standing in the world.

As to Grant, read this [link|http://faculty.css.edu/mkelsey/usgrant/presid.html|http://faculty.css.e...grant/presid.html] and tell someone will be able to write something similar about Bush after his presidency.