Right now play with either 84 or 87% realism (haven't started a new patrol in quite awhile) and firmly believe the main point of the game is to have fun; what fun constitutes for some people can harshly oppose other people's style. Long as you play by the rules/realism you have set (and potentially other self inforced penalties/game play methods) and play fair and square, if you enjoy the game and are having fun its done it job.
As someone pointed out several weeks ago, the only way to get
real 100% realism would be to stop showering completely, hang up all your food randomly about your house/condo/etc and then sleep in your bed (which you haven't washed any of the sheets for at least 6 months or more) to get a genuine 100% realism.
My style of play (hunting warships/task forces and harbor raids when they're juicy targets inside) generally conflicts with a lot of people's preferred way; while I do enjoy it uses a completely 180 stategy of the tactics that were generally applied. My thinking has always been to destroy all the warships/escorts in order to deplete the fleet such that in due time convoys will have no option but to start going unescorted or maybe can only afford 1 escort (had this been the real tactics and outcome).
On a different note......was up at my (now departed) grandmother's place up in Los Angeles with my dad (tagged along so we could both go Japan town after he took care of business with the realator) and found an old skool ice cream man driving around the neighborhood in a van playing the same song they all play. By no means was it a hot day, but buying something from the ice cream man isn't something I've been able to do since I was in elementary school; since then they've all disapeared. Was quite fun for a nostalgic moment