Bush's administration is nasty and corrupt. He has sacrificed the lives of American soldiers to improve Republican election prospects. He has stained the honor of America with secret arrests and torture. He has pandered to fear, prejudice, and willful ignorance, and he and his closest advisors have badly betrayed their constitutional oaths.
e.g.:
http://www.consortiumnews.com/2007/011807.html But, in fairness, Bush is not only a better pluralist than the late, unlamented Saddam Hussein, Kim Jong Il, or the increasingly demonic Putin; he's also far better than Hugo Chavez.
http://news.bbc.co.uk/2/hi/americas/6277379.stm Things could be worse.