The Commonwealth Connector, an independent entity that was established to implement the state health plan,
estimates that "over half" of those who were uninsured before the state plan was launched have gained coverage. That works out to be about 200,000 people, since the Massachusetts Division of Health Care Finance Policy said that 395,000 were uninsured before the plan was put into place. (A more concrete estimate from that state agency should be released in late summer.)

So while McCain is entitled to his opinion when he says the Romney plan is "not very good," we suspect a lot of newly covered residents disagree.