True and must, the guardian must have a standard criterion for who will be the husband of his daughter, this is the realization of his responsibility as a leader, but do not think that the standard criteria in this case is good looks or the position of the prospective husband, it becomes a major consideration for most people in this day and age. No, not all of that, but the standard criterion here is the criteria set by the example of the saints ie Rasulullah shallallaahu 'laihiwasallam. What are the criteria?
Religion and morals, that's it. If you as a guardian are approached by someone who wishes to marry your daughter and you are pleased with her religion and morals, these two cases have met your standards, then there is no reason for you not to accept them.
The Guidance of the Prophet sallallaahu 'laihiwasallam to the guardians, "If you are accosted by the person you have received the religion and morals then marry him