Mark, on my tv it automatically switches (if set for that) to "24p" for movies and that will not produce artifacs like jerkiness.
On video programs, 24p switches off and then images are also smooth.
I've never had problems with fast moving scenes.

Could these be called Anti Soap Opera Effect ?

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery