The unfamiliar valley

In robotics and 3D animations there is a hypothesis called the uncanny valley, which states that people accept robots or 3D avatars that either look exactly like humans, or that are very different from humans, but that they are revulsed by them if they are "almost human". I was wondering whether a similar "unfamiliar" valley exists for MMORPGs, and in how far that valley will hurt Rift.My theory starts with a personal observation: I do consider Rift to be a perfectly good game, but I feel no des

World of Warkraft...