I think it's because it's so different and it takes risks. Plus, it's really smart humor. It gives the audience credit in terms of not needing to tell them when to laugh. I love that about the show. There's no laugh track.
Sarah ChalkePeople don't always recognize how serious it can be, that there can be some serious complications from the flu and even death. People believe they'll be down for a few days and then be fine, and that's just not the case.
Sarah Chalke