Bad AI, I mean sheesh you can be leaving port and ships will actually move out of your way if on a collision course, But go inside an enemy harbour and DD's just charge you in a straight line thinking that they can gate crash a 15' wall???
Stooopid really it's this behavior like that actually takes the fun, adrenaline effect from actually going into harbours and trying to sink enemy shipping, if a dd sniffs you just get a harbour wall between you and it.....Game over...you can now sink everything in sight, and the bloody stoopid DD as well as it ain't going no where fast anymore.

Now if they really could stand off a little or even NOT collide with walls well that's another story.....Now you have to think is it worth it!!!!
It's AI behaviour like this which now stops me from entering harbours even if that part is actually a tense time, cos once your in you can fool DD's no end into jammin,rammin and burning themselves to bits.:rotfl: