The game is waaaay too fun. I've gotten to level 10, but not yet beaten it. I enjoy the game far to much; I sit at my desk, watch the infection spread, and cackle to myself. "Sneeze, my lovelies! Sneeze!" I also get offended when people waste their sneezes and when whole pockets of people remain healthy.
I am going to try not to examine that part of myself too much.