there are some definite douches in the greek system, but you can be your own dude, live your own life, etc. even if you decide to do a frat. i'm still involved in many non-greek things.
i just like it because its almost a guaranteed way to make some friends, create stories, and all that stuff. it feels good to be a part of something. but like i said, there are some tools. beware. just don't get so into the fratmosphere that you get the 'elite' thing going like KITNfury said.
just find a house that you can get along with the guys in. and there's always the partying aspect, if you're into that. frats tend to booze, which i enjoy.