as a man, i don't have much say on it, personally i prefer My face to be clean shaven, as it bugs the hell out of me, i physically hate the feel of facial hair under my chin/jaw so i shave it all off, plus i just don't really pull it off, but for whatever guy who does, sure, why not.
most of the girls i know don't really like it, if they do they prefer it clean cut, not a scraggly mess like most guys do who grow it out.