A lovely lady I once knew who ran a viilage playschool once said "There are no problem children just problem parent's" It was said very tongue in cheek so don't get your knicker's in a twist mums'
A lot of truth in it. 
There are many DCs who are monsters at home and angels with other people!
I think that you are so right,sunshinenanny, with one size never fits all-this is why I am always so against something being best for all babies and DCs. e.g. attachment parenting being better for all babies-it will be for lots ,but not for those who want to be put down in their own space.
I am firmly of the opinion that you need to wait and see the personality of the DC you get and respond tothe DC you have-not expect them to fit you ideologies when they haven't read the same books! 
A lot of Jo Frost's strength is just giving the parents chance to talk things over and to see themselves. Most parents, if filmed and played back, would be fairly shocked at some of it. It is easy to be a wonderful parent with rest,not so easy when you have been 5 nights, or longer without sleep!
My DS once taped me when I was all uptight ,because I was trying to get us out of the house for a day ,and they were not being in the least helpful-I am so glad that it got lost! We all have moments like that.
Jo Frost would find it so much more difficult with her own DCs. I think that I could sort out a lot of other people's DCs eating problems and I'm sure that I could-but then I am not emotionally involved. It is far more difficult with my own.