I'm a Republican and I support Bush, but he has made a lot of stupid mistakes.
Saddam acted like he had weapons of mass destruction and brutally killed his people. That said, I think the war with Iraq had a reason. Bush's "I-don't-care-about-most-of-the-other-countries-think" attitude he used in this is very, very bad.
This attitude is a large part of why the United States is not highly viewed anymore. But Americans haven't been really high thought of anyway.
The worst thing is the No Child Left Behind. It is basically the idea that if you considerate on one person while letting the others suffer, the one will do better. To bad that doesn't work.
Still, he still cares about the world, which is more than what some other people do.