I've been reading a lot of the political blogs... Lots of comments on how McCain came across as arrogant, contemptious and angry, and how McCain never once looked at Obama.
From a comment at the American Conservative:
Maybe I am influenced by how poorly Obama used to do when he debated Clinton, but I thought he did so much better than he has before that it has to be scored as a win for him. McCain was more aggressive, no doubt, but it is my impression that it translated into contempt and condescension, which are the things that everyone has been saying that Biden has to avoid when he debates Palin. He used the word naive how many times? He was scolding him as if he were a school master, but it is far from clear in any of the exchanges that he knew more. Obama was not forceful enough, but he was so much more focused than he was earlier in the year. McCain came off, in my view, as a snide, bitter old man. His comments betrayed the sentiment of, “How dare you even think that you can compete with me.” This is what Clinton thought, and it destroyed her.