Every frat and sorority is different. DGs at one school may be top-of-the-line, while at another they're two steps below Titney Spheres.
Skysooner (and I'm going to go out on a limb and guess he went to the University of Oklahoma like I did) has a near dead-on assessment of most fraternities here in Norman. I delivered pizzas in my younger days, and I got to see what the rushes and PR don't show: the Thursday night trashings at the Pike house, vomit in the living room at the Fijis almost weekly, the passed-out people in the hallways at the DTD, the urine-soaked carpets at Lambda Chi Alpha, and the ATO who tried to rape me during a pizza delivery. (I don't think he'll ever get all of his blood off of his trophy I bludgeoned him with.)
I also saw Sigma Nu and the DUs with almost sorority levels of cleanliness in their houses and SAEs boasting the highest GPA in the IFC, Kappa Sigs helping out with Habitat for Humanity, and Beta Theta Pi were almost always the best tippers. (As any who has worked for tips can tell you, the truest measure of person's goodness is by how much they tip.
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If you can, find some way to get the real scoop before selecting a fraternity. They are all different, some may be the first step on the road and others may leave you for roadkill.