I don't arrive until the fall, but in my experiences for school, i've had random roommates assigned to me (I live in the dorms) and they have both gone really badly. I know that this doesn't apply to everyone and some random matches may turn out really well, but I decided to find roommates beforehand and thankfully they all sound really awesome. It's really up to you, especially if you are looking for something specific in a roommate/suitemates.