I don't like to comment one way or another on other GLOs, but I would like to jump in and go on the record as saying that the Pi Kappa Alphas at my school were just the sweetest boys.
They weren't a very big house then (not sure about now, though), but they could always be seen wearing their letters around campus so they were a "presence". They seemed really tight with one another and proud of their brotherhood and, even though they had way fewer brothers than some of the "name" houses, they always managed to do well in Greek Week competitions.
We'd occasionally mix with them or a group of us would go up to some of their parties and we were always struck by how polite they were and how well they treated us.
All in all, a bunch of good guys!