Don't get me wrong, I like Romney as a man and as a business leader. I lived in UT during the lead-up to the Olympics in 2002 and witnessed how he took a tainted selection process and turn out an outstanding games on a relatively modest budget. He was chosen in particular because of his exemplary character as well as his business acumen and ability to grasp complex situations quickly and take charge.
I'm not predetermining that he will do poorly, I'm just noting that those who treat the country like a business don't tend to do well. I'm not saying that he will treat the country like a business (he at least has some public sector experience in MA), but that the economy of a country is nothing like a business. Far more of our economy is organic, meaning that it is not directed by top-down reasoning from DC or even any state capitals, but most everything in a business IS top-down.
The job that most businesses need from the government is to set a standard set of rules that apply equally to all, enforce contracts, and otherwise get the hell out of the way and let the market reward the winners and punish the losers. It isn't a problem that some businesses fail and that some people lose their jobs - those are vital and necessary components of a vibrant economy. When we interfere with those processes, which we do a lot of, we make our economy less vibrant and more reliant on rents and direct subsidies