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.
I am responsible. Although I may not be able to prevent the worst from happening, I am responsible for my attitude toward the inevitable misfortunes that darken life. Bad things do happen; how I respond to them defines my character and the quality of my life. I can choose to sit in perpetual sadness, immobilized by the gravity of my loss, or I can choose to rise from the pain and treasure the most precious gift I have ? life itself.