I must admit that I rather have the opposite problem, with innexperienced players who want to make special snowflakes, like a Klingon/Andorian/Vulcan/Xindi whose every limbs were replaced by cybernetic arms and legs, or an android with 50 guns in her chest. It's very problematic because we then have to explain the newbies that their character is going to be in a game with other characters who might shit themselves at the sight of their amazing monstrosity, which will make it very hard to play with anyone.
As such, I'm absolutely delighted when a new player wants to play a Human, because better stick with what they know than attempt playing an alien species they don't know much shit about anyway, and would make a bad rendition of, which would also hinder the fun for other players