I can tell you why I don't like these "reality" shows in general (includes home deco/reno).
Even though we all know they are fantasy, I think they still give the impression that problems can be solved in a weekend, or a week. Supernanny comes in and she changes three things and suddenly the family is blissfully happy! In 48 hours you can redo a kitchen!
The thing is that it really is fantasy. Real change, real parenting, real home ownership even, is more complicated than that - full of ups and downs and quite often without such clear cut solutions or easy fixes. I think when we fill our minds with these shows we often start to judge ourselves or others overly harshly. And then we feel out of control and we are not free to really apply our energy to - fully living, which is complex, full of starts and stops and steps forwards and backwards, and messy. MESSY I tell you!
That's my answer.