To be perfectly honest, I joined my fraternity a couple of years back primarily for the reasons that we "aren't supposed to mention" to freshman, i.e., the parties and girls. Being a very socially introverted kid without many friends, I was thrilled at the prospect of being somewhere where I could find a party six days a week.
Thankfully, that period of the fraternity is over, and in the time since, I have experienced all of the other great things that the college fraternity can provide: leadership development, brotherhood, lifelong connections, etc... Also, I have become so much more confident in almost any situation than I could have ever imagined.
So in other words, it's not always a bad thing to go Greek for the social aspect, but as long as someone discovers the other great things about Greek life, then the time spent in a fraternity or sorority will last long after the college experience.