One of the things spending 5 minutes on this site teaches you is everything you know about sorority life means about jack squat where it applies to everyone else. There are nearly as many ways to have a vibrant and successful Greek system as there ARE Greek systems.
Indiana and Iowa are pretty similar in the demographics, student population, etc. (of course, Indiana is a bit larger), but the way they handle their social calendar is COMPLETELY different than the experience I had. Ours better? Theirs better? I guess it depends on how much priority you put on parties. At Iowa there were seldom open parties and you would have been VERY odd to show up at an exchange (a social as Indiana SigKap defined it). And the multi-chapter parties weren't unheard of, but was uncommon. Like Monmouth Duo was a big one every year, but it's pretty clear who was invited to that! Ok, and their dates. The one variation there is the parties that happened in conjunction with philanthropies. The parties at the end of Derby Days or the Beta softball tournament were open parties, but I don't recall any open parties that weren't also part of a philanthropy. One result, I think, is less mixing between the sororities, and the fraternities who didn't make it onto your exchange calendar. So there's a real benefit to the system she describes. Presuming you can handle your alcohol that is