I do not trust him. As the saying goes, actions speak louder than words.
McCain was one of two Republican senators to vote against a $1.35 trillion tax cut that Bush proposed in 2001. McCain also voted against similar plans in 2003, as well as a proposed repeal of the federal estate tax. McCain said they disproportionately benefited the wealthy.
But it's your main contention that's just dead wrong, the notion that we'd be better off out of power is false. If we hate McCain's first Supreme court choice, say, Harriet Meyers is her name, do we or do we not have leverage to get her withdrawn? If it's Obama on the other hand, and he nominates the president of planned parenthood as a supreme, well, good luck “fighting” that one. You'd better off fighting a Forest fire with a garden hose.
It goes for almost everything else as well, and on foreign policy, don't get me started I'll be up all night.
It's not trust, it's leverage.