I like boobs, so I'm not really going to complain about female armor that follows breast contours. However... its not terribly realistic. I'm sure that building armor like that would be terribly impractical, and probably dangerous since it deflects attacks towards your heart. Not a good idea.
I don't really feel strongly either way, but I lean slightly towards more realistic breastplates that would basically look the same for men and women, rather than have them be form fitting death traps for women.