This Q&A is more evidence that Romney is what everybody has been calling him from the start; basically moderate, smart guy who is cunning enough to play the part needed to get into office. He's a former governor, a distinguished JD MBA, and he hasn't got a deep dark secret besides being a little too capitalistic and a little too obsequious to his Church. I don't think anyone doubts that he would be an excellent director of policy and decision-maker in chief. If there were 535 Romney's in congress who only slightly disagreed with each other on center-right versus center-left policy leanings, we'd all be far better off.
But that's not what we'd get with a Romney presidency. Romney is not the leader of his party; Clint Eastwood, Paul Ryan, and Grover Norquist are. What you see in Romney's platform and tempered responses (a four point plan here, a three-pillar foundation there) is not what you will get from the Congress elected along with him should he galvanize the base enough to keep the house and win back the senate. You'd get an agenda dictated by the hard-right and the tea party, with Romney stuck signing into law bills and policies that make government less effective and militate against his reasonable goals.
It's actually been pretty sad to see this Faustian bargain develop; Romney got the nomination and has a serious shot at the becoming #45 in the history books, but he's had to pander to the base of the party over which he has little if any serious sway anyway, and will be utterly subservient to their agenda while in office. A fun twist on the lame-duck phenomenon. On the flip side, the GOP gets an electable candidate, but one whose core views they know in their hearts will never really align with their own. It will be hollow, Pyrrhic victories all around.