I took a Childbirth Preparation class from our local independent birthing center. In the class of 10, there were 4 homebirths, 3 birth center births (us!), and 3 hospital births. We all felt the same way about birth being a natural process, etc, etc. Our instructors were a doula/massage therapist/belly dancer (fun!) and a midwife.
The class itself wasn't that informative for me (since I had been reading EVERYTHING birth related for 9 mos!)...and I wasn't even sure it was helpful at all until AFTER DS was born. I ended up reconnecting with all the women in the class, and now, 16 mos after our babes were born, we meet once a week every week! It's been an amazing support network, and group of like minded parenting friends that I never would have imagined I would have. As DH and I were leaving the last class, I remember thinking I didn't really care if I would ever see any of them again...just didn't "connect"! LOL! Now I talk to atleast one of them once a day!
With #2, I'm thinking I'll take the class again, not really for the info again. But to kind of get back in the mindset of healthy pregnancy/birth, etc.
As for your situation, though. I would think the class might be helpful if it were offered as a non-traditional focus, kwim? Like at a birth center, or with a bradley instructor, or midwives, etc. But going to a traditional "lamaze" class in a hospital setting I can understand might be a bit insulting, and not at the kind of energy you need before your birth.