My take: In the first half, Perry performed beautifully, demonstrating wit, strength, and a relaxed, natural poise. Then the question about the inoculation for schoolgirls that he attempted to enact placed him on the defensive--and he never really recovered, although after doing badly on that round he did come back in the last half hour, rising to a level of good-enough-ness.
Romney? He never did better than okay, seeming, at moments, condescending, and, when he attempted attacks on Perry, he appeared, for a moment or two, petulant.
On balance: Rick Perry helped consolidate his position as front-runner--but only that, failing to take command of the field.
And that, as I say, is my take.