Yeah, I think those shows -- especially Biggest Loser, because being sequestered away on a ranch is pretty artificial -- really skew what good/acceptable weight loss is for an average person. I would hate for somebody to just about kill themselves trying to lose 40 pounds in a month unsupervised... especially since Biggest Loser exaggerates the time frame (sometimes a week on the show is longer than a week -- it could be 10 days or even two weeks. Conversely, sometimes the "week" is shorter.)
Personally I remind myself that if I'm losing in a month what some people lose on the show in a week, I'm doing pretty good. You're kicking butt and taking names with your exercise, especially considering that you're working so much, unlike the Biggest Loser folks whose daily job is working out and winning immunity challenges.