More or less, I agree with Sullivan's take. What we saw was a serious man, ready to lead the nation, and, FINALLY, unashamed of his liberalism.
Most conservatives (other than Pat Buchanan, who gushed over it last night, and Bill Kristol.) panned it, but that's the thing. Obama has been trying, throughout the campaign, to utterly reframe the purpose and reasoning behind liberalism, turning it into a very patriotic, American ideal. If last night did not prove it, nothing will.
Was it his best ever? No, but it was very good and watched by 38,000,00 on TV.
Oh, and the set worked just fine.