Actually, I think this is the perfect example of what's wrong with the dialog in the show.I would say a 9, but I'm giving an extra point for "Fortunately, I was raised on Vulcan. We don't do funny."
"Fortunately, I was raised on Vulcan." Is the joke. The extra bit is superfluous and unnecessary and completely kills the timing. It the thing that frustrates me the most about the show, because it's such an easy fix. And cleaning up the dialog beats would go such a long way of greatly improving the show's snappiness - and I think make Burnham much more likeable for a lot of people.