Rock the beard if it's nice! I am so glad I didn't listen to SDN wisdom last year: 5 interviews and 5 acceptances with a killer beard. What's more, is that 7 out of 10 of my interviewers had beards. Note: I also had a hard part shaved into my head with a design at one of my interviews. Plus, if you have a female interviewer while sporting a beard...science is on your side.
If someone is going to dislike you due to facial hair, they need to grow up. If hair wasn't supposed to be on a man's face it wouldn't grow there. But if that **** is straggly or spotty, shave it.
Nevertheless, your major concern should be centered around whether or not your face is symmetrical.