I don't think it's silly. I just wouldn't watch it myself . I know plenty of people who feel that the more they see the better prepared they are. I'm a firm believer that it doesn't matter what I see on telly, my birthing experience probably won't be like what I see.
I'm going elective C section this time and I STILL haven't watched that show even having had a child before. Mostly because I had a very traumatic labour with him and it brings back a lot of yucky memories. So if you're comfortable watching it then I say go for it .