Two similar (well, OK, better) underwhelmed reactions from…
(1) Charles Pierce, “The Presidential Debate That Wasn’t Very Presidential: How Obama Let the Etch-a-Sketch Take the Controls“: “What you saw, I think, anyway, was the end product of the president’s consuming naivete as regards the American political process, as well as the end product of thirty years of a Democratic Party that has slid so far to the center-right that a Democratic president found himself arguing with a “severely conservative” Republican candidate over the issues of how much the Democratic president had cut out of the budget, how many regulations he’d trimmed, how much more devoted to the middle-class-kick-in-the-balls Simpson-Bowles “plan” he is, and how he would “reform” Social Security and Medicare — and, frankly, a Democratic president losing some of those arguments to his left. A Democratic president got through an entire debate and didn’t mention unions at all, even though the fact that our teachers are unionized here in Massachusetts is a big part of the reason why Romney got to brag on how good our education system is.

Seriously now, how much would you have bet going in that the president would spend as much time as he did on areas in which “Governor Romney and I agree” and not mention the famous 47-percent video at all?”

(2) emptywheel, “When You’ve Spent 3 Years Disdaining Criticism” (thanks for the shout-out in comments, Roman!): Obama had the same demeanor we’ve seen for years from him when he gets exasperated that critics don’t pay due attention to the catastrophe he inherited from Bush. Rather than listening to legitimate criticisms–at times, even from the right–Obama just purses his lips to hide his anger about the criticism and sends out an aide to make accusations about the Professional Left.

An interesting dissenting reaction from David Atkins, “hullabaloo”, “Three Reasons Romney Lost the Debate“:
1) The “Big Bird” moment. [...] Watch for the Obama team to do ads highlighting Romney’s desire to continue subsidies for big oil and other big corporations while killing Big Bird’s job. That will have a much more lasting impression on the race than the 24-hour news cycle generated by the debate itself. [...]
2) Romney just didn’t move the numbers as much as he needs to. [...]
3) Romney’s lies will come back to haunt him. [...]

Finally, just because it made me laugh, Andy Borowitz, “Millions of Americans Lose Consciousness.”

I think the fundamental problem is that Obama doesn’t really disagree with Romney on all that much…

I think you may be onto something there.