I know the Iraq war is a sore point to the international community and no one likes Bush-guess what? 84% (in the last poll I saw) of Americans feel the same. Our political system of voting does not leave the Presidency merely to the popular vote of the citizens, as with the case of Bush, politicians weighed in more heavily than the citizens did. It was our politicians who put him into office. So what would you have the American public do? What would you do if it happened in your country? Storm the capitol and take out the President? I think not. SO why the critism against us?
I think the problem is, the rest of the world could see what Bush 'was' and was 'doing' but it's only now that Americans have become unhappy with him and that is largely because things didn't go according to plan. If you had won the war, had a smooth occupation and cheap gas then I don't think most Americans would have minded that it was all done on a pretext.
The fact is, he was elected and his policies received popular support or at least the electorate was manipulated easily enough to give permission. Your political system is weak and is there to serve the industrial military complex and other big business.
While America may be 'big' and have a big population it is no excuse for people not to be interested in the wold at large as most other populations seem to be (a sweeping generalisation but one that I don't think is disputed).
And yes, for what he has done people should be clamouring for impeachment - the political equivalent of storming the capitol and taking out the president. He's an albatros and has severely undermined the standing of America in the world. He pissed away global good-will after 9/11 ... quite an achievement.