For the most part, I found it comparable to Joe Biden’s speech. It did what it was meant to do, attack the other side’s candidate. Although, Palin also had to introduce herself, which I think she did well.
McCain is about to speak, so I can’t get into specifics right now, but I have two nitpicks I’ll expand on after an entry on McCain’s speech. The first is that she faltered a little when she got to foreign policy. You could hear it in her voice; she was clearly uncomfortable there, though she did make a partial recovery, and made it quickly. The other was her statement on opposing the “bridge to nowhere.” That one was…incomplete.