I read the article and I must admit that I was impressed that they even touched on the subject. I didn't think that the article was awful and I think that made a couple of good points. Of course it's been a while since I read it. I read it more as we often put too much pressure on ourselves to be perfect parents and do things in such a way, but that it often isn't realistic for one reason or the other. I think their whole point was that we should relax and not focus so much on following a specific parenting philosophy but rather on taking care of our children's (and our own) needs individually and instinctively.
If our child happens to be one of the 15% who don't like slinging (as was my first) we shouldn't beat ourselves up for it, or consider it some sort of AP failure. We are still attached parents. Unfortunately, all too often we consider it a failure if co-sleeping is less than fulfilling for us, or if our child hates the sling. I read their point to be that any parenting philosophy, but AP particularly because of the physical as well as emotional attachment to the baby, can wear a parent out if they feel that there is no leeway for individuality or personal preference.
For example, I consider myself to be an AP parent, but I am an awful sleeper, so co-sleeping simply isn't my bag. I moved my second child out of my bed at 6 months because I was beginning to resent him being there. I was a much happier and believe it or not, more attached parent when I did. I think that their point is that in my situation, many parents would have felt like failures as AP parents, or would have continued on co-sleeping despite their resentment (which isn't healthy for anyone) simply because AP preaches co-sleeping.
No, it wasn't my favorite all time AP article, but I do think that if we read it without a bias it does make some good points. I would encourage anyone who is infuriated and thinking of writing a letter but hasn't read the article, to at least read the article first. At least they were daring enough to at least educate their readers a bit about what attachment parenting is. Think of all the parents who read the article but had never heard of AP and may be considering some aspects of AP because now they know that other parents do the same things.