IM for realistic.
If I dont have to wait hours for a "sink" message, that would be great.
I know in real life, ships didnt just fall to the bottom like a rock even though a torpedo just struck its keel.
Even split-up ships bobbed because of trapped air.
I personally would like to see more visual "eye-candy" explosions, holes, etc.
Heh, I sank a Minelayer yesterday with my deck gun, 3 visible holes in the hull below the waterline in different places...10 min later...abondon ship.
I love it.