Deck guns always take a long time to kill medium to large vessels in my experience. It's best to use the gun against single ships in an area where you aren't worried about air cover spoiling the party.
As for the AA guns, in Iron Coffins the author mentioned that if they spotted an aircraft at a fair distance they would always dive. They'd only turn to the AA if the plane was spotted very late and would drop its bombs before they could submerge. I guess knowing when to dive and when to make a fight of it is a judgement call you need to make on a case-by-case basis.
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Oh worse than Hitler! You wouldn't find Hitler playing jungle music at three o'clock in the morning!
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