@ePICFAeYL, I'm not sure what your school is like, but I recently graduated and ran an engineering council that oversaw every organization (fraternity/professional/etc) in the engineering college. Do fraternities have benefits, sure, 100%. They will help you build connections, teach you how to deal with idiots, some of the better ones will connect you to companies in your field. But, non fraternity professional organizations will do that more effectively. If your plan is to pledge I strongly encourage you to at least consider going to some other organizations meetings to see if what they offer is any worse or better then the fraternity. Because while fraternities aren't necessarily negative there are very few that will look as good on a resume or be as well respected as a national professional organization in your field. With one huge added benefit. A fraternity is judged by it's worst member. It's judged by that jackass who looks at the girls weirdly, the one who hazes the members, the one the professors all hate. If there's anyone like that in the group you're pledging too then I strongly recommend you reconsider or you risk having your academic and professional reputation being damaged by association with this group.
You're arguing that your fraternity doesn't do anything negative, but you need to make sure that you know that for sure before you join, because it's your responsibility to make sure that you don't associate with people who are going to bring negative attention to you. You mentioned that your fraternity has the lowest membership in years. Have you taken a few minutes to ask around outside the brothers and ask why that is? If this fraternity is as great as you're saying it should be the one with the largest membership on campus.
So I'm not saying don't join, but make sure you understand how your fraternity is viewed by other people on campus, how it's individual members are viewed, and why it lost membership in recent years.