I've been in worse.
On the most treacherous sea of them all, the Baltic sea.
During commie times Polish passanger ships used to go out into the worst stormes(not allowed today). When they returned to port they used to have some windows smashed by the waves and the deck was very often remodeled, so to speak.
An other funny thing was that they didn't have any arrival times, they left Gdansk harbour at 1800 hours and reached their destination, as fast as possible.
Those where the days, though I feel much safer when I travel by boat from Poland nowdays...