Greek life at Bradley is definitely noticeable, especially during recruitment. There are lots of shirts with Greek letters on them and the fraternities' and sororities' significant presence on campus may lead some to think most of the student body is Greek, but that's not the case. Some people say campus is distinctly split into Greeks and non-Greeks, and they live in segregated worlds, but that's exaggerating a bit. While Greeks are proud to be in their houses and definitely have a presence at Bradley, it doesn't mean they aren't involved in other activities or don't have other friends. There are many options and varieties of houses to join, especially considering Bradley's small size, and students don't have to be the stereotypical Greek depicted in the movies to fit into one of Bradley's houses. There really is a frat or sorority for everyone.
The Greeks throw a lot of parties, so they're hard to ignore, but it doesn't mean students have to be Greek to have a social life. The majority of the student body isn't Greek, so there are always other friends to find and other things to do. Fraternities and sororities are generally respected on campus, though the influx of Greek letters during the first few weeks of school gets old quickly. But after recruitment, when the letters calm down, the Greeks and non-Greeks are indistinguishable.