So, what do people think about Senator John McCain's qualifications as commander-in-chief??

Personally, IMHO the President's role as Commander-in-Chief is the least important role when judging whether or not one should vote for such-and-such a candidate. Would put what the President can do about the economy, education, civil rights, national security, diplomacy, the environment, the mess of our legal system, and a number of other areas as more important than his or her ability to fight a war. He or she does have the Joint Chiefs of Staff.