It depends on the situation, your age, and the way you generally accept or reject potential shidduchim. One of my daughters who is 5’2″, really prefers to date guys at least 5’8″ or more. But she HAS accepted dates with guys her own height or just slightly taller, so as to be more flexible. She has come to recognize by doing that, that guys who are that short make her feel physically uncomfortable, when she is at eye level with them. This is a purely subjective issue, and no one should be faulted for it.
HOWEVER, if a girl is rejecting guy after guy becuase he is not 6′ tall, she should ask herself how serious she is about meeting a nice guy. Not all guys can be tall, just as not all girls can be blonde and blue-eyed (or size 2).