"The foreign policy that John McCain now advocates is reckless and promiscuously interventionist. If he were a university student majoring in international relations or security studies, he would deserve a resounding F for his analysis of the crucial issues that the United States has confronted over the past 14 or 15 years. After a promising start, his performance has steadily deteriorated. The last thing that America needs is an even more aggressive and incompetent steward of foreign policy than George W. Bush has been."
Click through to read the article, it's pretty in depth and follows McCain's increasingly hawkish stance since he came to Congress in the early 80's.