I admit that's a bit of hyperbole, but you try to tell me Bush won't go down in history as a great President? What Democrat would you put ahead of him? Aside from Jefferson, and the Democratic-Republicans aren't exactly like the modern Democratic Party?
I think if Pres. Bush does something about the open borders and spending in his remaining years this term, he will go down as a great president. In any case, his response to Islamofascism will certainly ensure his place in the history books. That said, there is NO comparison between the four great presidents you mentioned and GW Bush (IMHO).