I don't know if it's an attempt to please the audience per se, as much as simply an attempt to translate the visual language of manga onto the screen. These kind of moments probably do play better in Japan, though. I've had several non-anime fans tell me that comedic deformations are one of the things they dislike about the medium as a whole.
Aside from the general level of ugly in Jormungand, I found comic deformation/anime faces to be really intrusive. I've no idea how rough it is in Rozen Maiden though.
Compare the regular expressive designs:
to
I've also no real idea why this still bothers me. :lol Guess I was hoping the show just wouldn't need that sort of crutch.