Agreed. Only adding sound effects would do a lot, although I'm one of those who dream of an actual crew running around doing actual things. Fishermen hauling nets on board, tug boat-crewmen preparing to tow a crippled aircraft carrier back harbour [think GTA, with the ambulance and the paramedics arriving when you kill someone], gunners rushing out of the ship to man the flak guns when enemy fighters appear, survivors scrambling over the ship's side and lowering life-boats when the ship is sinking, and so on. Or, of course, surprising a merchant or partisan-crewed fishing boat and seeing the crew burst out on deck with rifles and sub-machine guns and open fire on you
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I wonder how much the RAM/CPU load would be for something like that?