They value on-time, professionalism, quality of food and comfort. They don't care how much jokes FAs can tell or how chatty they are.
As one of "them" (albeit now dual "them/us" for nearly a decade now), this is quite illuminating. Didn't realize that what would appear to be such fundamental expectations from an airline are, by your inference, novel to the North American market...
You're right that I couldn't give a proverbial about chatty/jokey FAs, though. Do your job, and be professional. With the exception of my YYZ-YVR segment lasts week, I really felt that WS had been moving towards the former in the last couple of years (in my admittedly, relatively limited experience compared to some on this forum)