Essentially, the NCT is an independent charity whose goals are clear. If you don't like it, don't be involved.
Personally I feel that their work is important, if you believed everything that the NHS told you (according to my MW: our bodies aren't cut out for childbirth any more, birth plans are pointless as it is "all in the lap of the Gods, or should I say surgeon hahaha", BF rarely works so get some formula in and know how to use it) then you'd be going into childbirth very blinkered.
Whichever path you choose to go down, surely you want to be informed? If you want to go down the heavily medicalised route then the NHS is there, if you want to know and understand your options then the NCT is there to provide the alternative viewpoint. Surely that can only be a good thing? Take the information and make of it what you will?
The natural route on the whole does have the best outcomes...minimal intervention is proven to be best for both mother and child apart from when absolutely necessary. All intervention should be both timely and appropriate, not just because you have been "in the system" for a set number of hours therefore they have to move you along. (Yes, I had a classic cascade of intervention ending up with an epidural that could have knocked a horse down at 20 paces, an epistiotomy, forceps and a whopping blood loss.)
It is also a tad silly to label those who do want a natural birth as some sort of crazy hippy, the God of medical science has proven that a VBAC is the safest route for a baby, and the heavier the drugs you are given the less likely you are to have one. You try pushing a baby out paralysed from the neck down, relying on a midwife to tell you when you are having a contraction. And natural term breastfeeding (note I said natural term, not extended or some such silly term) is also perfectly normal.
So fair enough, don't give a toss about a natural birth if that is what you want. But why try to knock an organisation attempting to redress the balance for those who do?