Actually, both Abe Lincoln and FDR attacked the constitution more significantly and in more ways than Bush.
Both Lincoln and FDR mismanaged war efforts in an order of magnitude worse than G.W. Bush. The fact that both of them won their wars doesn't exonerate them from not understanding how the military worked, and picking the wrong guys to run the war effort, initially.
Even Truman made worse foreign policy mistakes than G.W..
G.W. is "Bush-league" (pun intended) in comparison to them for his screw-ups. What makes him SEEM so bad, is proximity. It's happening right now, so it seems that much worse, to us.
One of the greatest things about this country, is how the country has perservered, despite some pretty uniformly poor presidential leadership.