Think L4D2 is an expansion? You're an idiot

Left 4 Dead 2 released this past week and while most people are having fun with it, there is a dedicated clan of people who are determined to convince the world that Left 4 Dead 2 is not a real game. These people, who we shall class as "idiots," have labeled Left 4 Dead 2 an expansion pack, unworthy of accolade and recognition.