I haven't avoided the show, but after two episodes, I couldn't tell you why. I haven't the faintest idea what people are on about. The show isn't particularly bad, but there's nothing particularly good about it either. I realize that the comic probably served as the inspiration for other things, like High School of the Dead or Left 4 Dead, but frankly I find L4D's characters more likeable and interesting and the plot more believable and engaging.
I just don't see what it is in this show that people think it's so great. I don't know-- maybe it's me.