Two experiences. One good, one not so good. As long as there are no hurricanes you should be fine.
Prior to the construction of the current terminal and parking deck, everyone parked in the open lot. During the cruise, storm surge from Hurricane Sandy flooded the parking and a lot of cars were impacted, including ours.
On the bright side, Mrs. Jones did (and still does) enjoy her new ride. Also, we always park on level 2 or higher in the parking deck.