I've read several analyses of the vice presidential debate, including that of Dan Balz. To date the one I like best is that of Peggy Noonan, the former Reagan speechwriter and columnist for The Wall Street Journal.
Noonan lays out what each needed to do in the debate and then analyzes whether each accomplished those tasks. Her conclusion: Ryan largely succeeded, Biden largely failed.
You may say that's the outcome I wanted to read, and I admit that is true. Nevertheless, her analysis is good.