Sensors do play a role.
However,
The Campaign files also play a role.
In the early part of the War,
Crews are not rated as highly so weapons and such are not going
to be as dead on as later years.
Here's a simple example to try.
Create a Single mission.
Place 2 WarShips in it.
One with a novice crew
and one with an experienced crew.
Then have fun.
