Coming in a bit late, but I will have to be humble and admit that Romney won this first debate for the most part.
He was calm, collected, professional, yet simultaneously hyper, rigid and steadfast in his approach to attacking Obama, as well as defending his "plans" with something less vague and a little more tangible than what has been shown throughout his campaign.
Obama unfortunately played it a little too safe and approached his attacks and cross examinations with almost a sort of neutrality, bringing great points, but ones that ultimately supported Romney, rather than justifying the accomplishments of his term along with his projected approach to the contemporary subject matters at hand.
This in combination with a moderator that was too easily intimidated with a noble, but unrealistic format left a perfect playing field for Romney to take the lead, while Obama took a diplomatic, and thus submissive approach to what should have been a debate akin to a boxing match rather than cat fight or apologetic argument.