I agree on alot of this stuff. Worst is when the nct leader's medical knowledge around 'un-natural' birth is wrong, because she doesn't approve of and therefore doesn't bother to become knowledgeable about it.
I did the classes with DS1 and my biggest gripe was completely wrong information around c-section. DH and I were told as part of the (very short) session on intervention that a 'crash section' was a life or death emergency for both mother and child, always done under a general, and involved a vertical cut from the bottom of one's chest to one's front bottom (not in those words but she mimed the length and position of the cut). It is of course clear to me now that she knew very little about sections BUT I trusted her at the time (why wouldn't I?). I didn't like the mood among all the other parents though, which was that natural birth is of course best for anyone with any class and that I was very woosy for asking about epidurals and sections and saying I wanted as little pain as possible. One of them told me later I was known as 'epi girl.'
One month later and DH and I were hearing 'crash section' shouted down the corridor at the hospital and I was shakily signing the form. Husband burst into tears as he thought it was, as the NCT leader told us, life or death and I was maybe going to die and almost certainly our baby. Of course, it was all horseshit and all 'crash section' really means is 'now, not in half an hour.' It was done under the epidural I had already had and although it was termed an emergency section, this is of course not always the same as 'life or death.' Needless to say, it was the usual bikini line incision!
The next day the head midwife passed by my bed and we had a chat and she was shaking with rage about what we had been told.
At the 'nct reunion' I very nicely pointed out to the leader that the info had been wrong. She said vaguely 'Oh yes, every section is different.'
To echo what another poster said, I met some good friends there and we are still friends 4 years on. But I don't rate the classes and found them a little sneery about my choices. However, most worrying was the fact that a lack of approval or understanding about sections can translate into incorrect and frightening information.