I don't find it completely negative. It has a point, it can be dangerous for some people but as every diet can be not done properly. I read the exact same warnings and side effects about the Dukan diet, a lot of people say it's dangerous and they don't care about the people for who it's working.
A diet/WOE is very personnal and not all the diets is suitable for everyone. I think the most important is to keep an open mind. I don't mind for the criticisms, it's positive. It would be really suspicious if everyone agreed with it.
They are right when they say that one should listen to one's body. It's the most important thing
More than that, I know it's working for me. I lost a lot fairly easily, I am doing 1h30 exercises a day, which never happened....ever... and the last time I did proper exercises (3 to 5h a week) was more than 20 years ago, my periods improved, I know know how to recognize when I feel "full" and I could go on like that. No complains.