QM2 is a very stable ship. We were in a Force 10 at the end of June and most of the passengers were out and about and many were sitting by the picture windows watching the sea crash against the ship.
However, any ship can move about. To a large extent, it depends upon the direction of the winds and waves in relation to the direction of the ship. If they can, the crew will try to maneouver the ship so that the wind and waves are coming from the side as this tends to steady the ship. The stablizers and the balcony cabins, which act as stay sails, minimize the rolling. If they have to cut through the waves, that is when most people will feel the motion (this is known as "pitching"). The stablizers don't have much effect on pitching.