Hadn't thought of it before, but there really has been a lot of crap coming down out of the rafters during Bush's presidency, hasn't there?
Not to say it's all his fault: 9-11 is owed primarily to Clinton's lousy performance on foreign policy and his failure to deal with al Qaeda well in Somalia, after the embassy bombings and after the U.S.S. Cole (though Bush did a good job of ignoring terrorism until 9-11).
Invading Iraq was his decision. To an extent, perhaps that can be blamed on faulty intelligence, but there's been plenty of testimony that Bush wanted early on to invade Iraq.
The hurricane, though, I can't see what he could have done to prevent that, aside from a) appointing a FEMA chief with actual disaster management experience, and b) doing whatever he could have done as chief executive to ensure that relief was ready to go once the hurricane hit.