I wouldn't enjoy having sex with someone who didn't make a sound or show any reaction at all, just off putting and a little creepy. I value communication and I like to know when I'm doing something right!
A little noise is desirable, but one who shrieks her head off as if she's being murdered is a definite no.
How much we talking? If she's screeching like a banshee I do worry for her.
Inb4 OP is a 22 year old basement dweller.
Do you mean vocal as in moaning etc or vocal as in telling you what she wants??