I do play it at the hard level, and lately, at real time. Just to get that feel for what it must have been like, from the times of sheer boredom to the crash dives and dc attacks.
And its an added plus to go to sleep to the hum of the engines, but when the crew yells ALARM!!! you wake up in a hurry.
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A quote from Donitz; “The reason that the American Navy does so well in wartime is that war is chaos, and the Americans practice chaos on a daily basis.” “For the lessons one fails to learn during peacetime, one pays a high price in war.”