AF has no place on a serious video camera.
"Just don't use it. Just ignore it. Just put up with it. And no, it won't be cheaper without AF."
same as video on each and every stills camera.
Haha, yes. Very good.
The pedant in me would point out that video adds virtually no cost to a live-view enabled DSLR, wheras adding AF to a video camera body requires extra components. The C-Series must be one of the first professional camcorders to have in body AF.
At a professional level, which is where these cameras are pitched, AF is not required. It really isn't. I've chucked folk off my sets for using AF on hdv cameras.
For shooting crappy family videos, AF makes them a bit less crappy. If you know how to manually focus video and have a well set up video camera, then AF really is absolutely superflous.