On the positive side, the author says weightloss and subsequent maintenance is nearly impossible. My reaction to any statement like that, is "Oh yeah? watch me!" I don't think this is what she had in mind, though!

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In general, I don't think the book contributed much to the body of popular dieting literature. I found it discouraging and depressing to read so called scientific evidence proving what I already know, that weightloss/maintenance is difficult.
For inspiration, there a lots of other books to read that present a more positive outlook. I also like to remember that there a plenty of other folks who quit drinking with AA, or quit smoking through various support groups. These people are also in the minority, but they did it! So can we.