I loved my NCT antenatal classes! I think perhaps your experience is more a reflection of a bad teacher who did not listen to the wishes of her class - or perhaps she did listen and your wishes weren't in tune with the rest of the class?
I think out of the 7 classes we spent:
1 on getting to know you and listing what we wanted the course to cover
1 on birth labour generally including protocols, questions to ask, other options when intervetion is suggested etc
1 on birth and pain relief options right through from natural management to epidural and the pros and cons of each
1 on birth complications (which included a simulated c section and talk about other interventions and when they might be needed) 1 on post-birth, coping with the baby, nappy changing bathing etc,
1 class on feeding options (breast and bottle), attitudes, pros and cons etc.
Plus 1 women only coffee morning on breastfeeding pros and cons and possible post-birth issues like postnatal depression and incontinence.
So out of the 7 classes there were 3 focussed the birth, 3 focussed on post-birth, and 1 general social class.
The emphasis was on being kind to yourself and your partner - I think there is plenty of pressure from society and family to be up and about in a couple of days and it was actually really nice to have someone in an authoritative position saying "well that's fine if you really want to but you don't HAVE to", and really important for the men to understand what a major procedure giving birth CAN be (not necessarily but it's the women who have a tough time and need extra support afterwards who need this advice).
So yes, I think YAB a bit U, just because you didn't find your particular class very useful, doesn't mean they are all rubbish!