if it was a multiple choice poll, I'd select
Completely not historical, unless you are the skipper of U-47.
Shameless exploitation of AI weakness
Exciting set piece challange, with both prize and risk 
Since it's not, I voted for
No thanks...
I only raided a port once, Gibraltar in june 41. I made two attempts. First time I approached in rough weather, was detected and barely escaped. I returned the following night, sunk the Nelson and got away.
It was one of the most nerve-wrecking experience I had in this game.
Privateer, your 'not so nice' mods for Harbor raiders sound interesting.