In my limited experience I feel there's a real cultural mis-match with kids from other countries coming here to study. Most of the kids I met were from huge cities and the shock of being in a small college town was in many was too much for them. That and the greek system was overtly hostile to them.
On side a note it's humorous what many kids take back with them from their time in America. It's worth doing an image search of "American party" to see what I mean.