True, it may all end quickly and badly.
However when you have a squadron of say 5 Armed Freighters thats a FP15 battery for 100pts. Opponents usually underestimate them too, allowing one round of shooting before they get destroyed.
I know some people are unhappy with the current points (90) and stats of the super heavy freighter, so i've designed one i'm more happy with.
SUPER HEAVY FREIGHTER
Battleship/10
5+ Armour
2 Shields
2 Turrets
15cm Speed
FP 6 Weapons Battery 30cm L/F/R
FP 1 Lance Battery 30cm L/F/R
Has enough firepower to scare off pirate escorts, but not enough to do much to a cruiser sized ship.
120pts