I wasn't a college runner, but I was in a fraternity. Here's some advice from an honest alumni.
Whether you should join one depends, first of all, on what campus life is like at your university. At mine, 40% of the school was Asian and 30% commuted, so the life of the school was concentrated in the remaining 30% who were White and lived on or near campus. Any of those 30% who were at least semi-cool ended up going Greek. You would feel left out of school life if you weren't Greek. This might not be the case at your school because maybe it's not as divided into enclaves as mine was.
Second of all, whether you should go Greek depends on what your expectations are for joining a house. Will you settle for nothing less than a top-tier house because you want to be associated with the most popular guys in the Greek system? Are you just looking for a group of drinking buddies? What are you looking to get out of a house?
On the same note, I would say that you need to ask yourself whether a fraternity is adding to your life anything you couldn't get without a fraternity.
Leadership opportunities: There are certainly some to be found in a fraternity, but you can alternatively take up a leadership position in a campus club. Which looks better on your resume: President of Delta Kappa Epsilon or Student President of Chemical Engineering Department?
Parties: Even if the fraternities are the only places having cool parties at your school, you can get into the parties just by knowing someone in the house and paying $5. Whereas, if you're in the house, you'll be paying a social bill of hundreds of dollars every semester to finance these parties.
Brotherhood: Certainly you're capable of making close friends yourself. If you feel like a fraternity is the only way you're going to get a close-knit group of friends, then you are a social retard who shouldn't be joining a fraternity.
Test files: Fraternities like to highlight test files as being one of the unique scholastic advantages of joining a fraternity, but these days you can find old exams online through your university.