I agree.  I do sometimes try for celebrity likenesses, and I usually include some asymmetry in all my renders, at least of expression, just because I think it makes faces look less creepy, but I don't go for "realistic."  IMO, Poser is now capable rendering images that are deep in the "uncanny valley," and I generally try to steer clear of that.  Though it's not easy.  I've been using Poser so long that I'm used to it, and only dimly aware of how creepy normal people find many Poser renders.