I've always thought romney's experience as governor is WAY more telling as to how he would be as president. you are STUCK with things that suck about the state. In business, you can call a company a dog and avoid it, call a company a cow, and milk it, etc. In govt, you're stuck with the problems of a state or a nation.
Romney would do a fine job - he's a capable and smart and very accomplished man. I don't think he will change much as president.