The Castellan wrote:
Good if you're an escort and are attacking with DHCs up front, so you can be firing the turrets at the same time.
Total crap if you're in a cruiser, because you could be broadsiding with a beam array and getting 3x the damage...
I heard turrets on the rear are good when you are turning and so on.
THe basic principle is to have as many weapons firing as you can manage. Escorts typically use forward facing cannons, so having rear turrets that can also fire forward makes sense.
For cruisers and slow turning ships that can't easily keep their forward constantly pointed at their targets, it is much easier to broadside the target and have both fore and aft beam arrays firing.