Well, she didn't humiliate herself, and certainly outperformed the embarassingly low expectations she set for herself. Polls seem to handily give this to Biden, which is actually correct, and the consensus seems to be that this won't change anything in the polls, which is good news for Obama.
What was distressing about Palin up there was that she staunchly refused to answer some questions by bringing up things that were never asked of her. It would have been nice for Gwen Ifill to even mention that, but one can't ask for everything.
This image of how she approached the debate sums it up better than I could ever hope to: