You must remember that the deck gun is not very powerful compared to a torpedo. The submarine is extremely venerable on the surface with the deck gun un-pluged. As the war progressed the ships got bigger and thus more shells where needed to poke holes in the hulls of ships. Towards the end of the war the deck gun was really just a morale kind of thing in such it didn't do much but gave the crew piece of mind. It is useful for sinking the sampans or ships that when torpedoed arnt going down.
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No amount of experimentation can ever prove me right; a single experiment can prove me wrong. - Albert Einstein
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