How is it on A320? In B737 it is not recommended to use the doors in a ditching, only over-wing hatches. Thus the pax are relying on life vests for buoyancy. Rafts were not carried as non-ETOPS, but ditching between STG & FNC or LIS & TFS it would be nice to have slide-rafts, but then you can't use the doors. It was always a circular discussion, during SEP recurrency, about shifting pax a little to raise one set of doors above the water line, inflate and detach the slides; even repeat the process for the other end as the pax made an 'orderly 'exit onto the wing and the not so inviting winter sea.
It would seem that the A320 on Hudson was hatches & life jackets only, by design.