I understand completely where you're coming from, and it's true that fraternity life isn't for everyone. I'm offended by Rule's posts, not yours...but I'll respond anyway. Keep in mind that greek life varies from school to school, and from region to region. I am certain that I would not be interested in joining a fraternity outside of the Southeast, it's just a different way of fraternity life than the northern or western regions. (i.e. complete douchebags with gelled hair, steroid arms, and fraternity letter shirts)
One common thing though that breaks regional boundaries is that fraternity men are some of the most active and well rounded on campus. On my campus it is especially true. In the case of my own fraternity, out of 31 brothers and pledges we have several people on the volunteer fire department, a couple student senators, athletes (baseball, golf, cross country), President's Men (a handpicked group of students that represent the school at on and off campus social gatherings and galas, etc.), some from this hand-selected leadership society on campus, several people on the Student Admissions Committee (myself included, and it's a significant honor to be selected for it), one guy is in ROTC, another leads a Bible study each week, and one of our alumni from last year is now a dean of the school. I'm sure I've missed some positions, but I'm sure you get the idea. In regards to majors, I go to a small private (but still tier 1) liberal arts college. The two most popular majors on campus are Political Science and Economics (it's a school that sends kids to law and business school basically) so that's what most people study. There is a Science fraternity Alpha Chi Sigma which is only for Science majors, and they have the highest GPA but aren't considered a social fraternity (yet they still have a fraternity house and hold just as many parties as social fraternities). Not to mention my own involvement in detail, but I'm involved in several things around campus yet still (at least so far) am on top of homework and making good grades. In addition to school work and my other commitments, I'm still able to drink and mess around with my brothers on the weekends and sometimes during the week (I live in the fraternity house).
What I'm getting at is that fraternity men are men of several talents. On the weekend I like to go to a band party that either my house or another is throwing, drink, and dance with girls. It's a good way to relax on Friday and Saturday nights and not worry about Sunday-Thursday. Sure, my academic schedule and major may not be as hard as yours but I'm able to do things with my time other than school work. We get our stuff done, and it's unfair for rule to blindly stereotype a group that he knows nothing about.