whats up with her using just her first name in the credits? its not like shes the next "madonna" or "cher"

Well, Martha MacIsaac are her are supposed to look like high school kids, even though they are 22 years old. Can you image them casting actually 15-17 year old girls to be the "sex objects" of this raunchy movie?

I agree. She does have a pretty face, but it's the face of a 13 year old. I suppose that's a plus for an actress, at least if she ages slowly.