Many times, the size of the Greek life has something to do with the length of rush.
But the hard problem is running so many people through in a short period of time. How do you truely get a feel for the members and vice versa.
I always called it a cattle call and or a crap shoot.
While I went to summer school, I got to meet almost all of the members of the Fraternities and pledged a local that went to a National. I left and started my own as while each was good, I wanted something new.
As someone so stated, lay back, meet members in classes or out in other public places. See waht they are like. It won't take long to get a feewl
Bigger is certainly always better. See what each does with charitys or participation on campus.
Good luck and I hope you find you home!