In World of Warcraft, I think the only race in which I would play a female character over a male character is the blood elves. One reason admittedly is looks. I like the way the male models look for all races over the female models, except for blood elves. Blood elf females just look tougher than male blood elves. Maybe that is because they are! Exhibit A is this classic video by Percula showing an assassination attempt by a blood elf on an Alliance official in the heart of Stormwind.