I let my father-in-law borrow it because he was looking into losing weight and was confused about all of the info against soy, so I marked that chapter from him. And when I pointed out that it was written by R.D.'s he said, "Yeah, I noticed that a lot of the articles online are really biased, like there was an anti-soy study I found that was funded by a dairy council!"
Many of the worst anti-vegan, ant-soy rants I see on the web are published by "food writers"....translation, people without any relevant education or degrees. Any time I see any article on the web published about nutrition I check the date, the name of the author, the credentials of the author and how they earn their money.
Unfortunately there is no easy way to judge an article as being "safe", in regards to facts. Yes, if someone has NO credentials, like the "food writers" you can dismiss it as bullshit. However, most MDs don't have any nutrition education. It isn't much better with RDs or other degreed nutritionists either. Unless an individual RD has a strong interest in veg*n nutrition.....or.....even staying up on the latest research, they are going to speaking from the default view of nutrition they got during their undergraduate education: very conservative, very out of date and very animal product centered.
If I wasn't familiar with Norris' and Messina's writing.....or vegan nutrition I would be suspicious of what they write as they are animal advocates and have a vested interest that way. However, since they also bring up potentially unflattering points, I see that they are trying to be fair and balanced.....no matter where the facts fall.