yeah, body roll can negatively affect handling in a number of ways. First, steering response is hurt because you must wait for the suspension to load up before the car actually changes direction. Also, the more body roll you have, the more likely your tires are to have poor contact with the pavement. Ideally, you want the tire flat to the ground during a turn, but if the car is leaning over 5 degrees, only part of the tire is doing its job. Of course, its impossible to totally illiminate body roll in cars like ours, but limiting it will improve your handling.

What is your suspension setup? good ways to reduce body roll are swaybars, higher spring rates, and better dampers. You'll also find that a bit of negative camber will improve tire/pavement contact too.