The turret view steering and zoom generally improves gunboat ability to fight multiple small ships. This is most notable when the GB is targeted. The fact that GB missiles don't do hull damage reduces the need to target the GB first so it partly offsets this change.
At the same time this makes GBs with missiles good at escorting capships since the large energy damage can keep bomber from firing Supernova/Nova.
All this said GB missiles are like all other missiles extremely affected by lag, with no lag they are clearly overpowered, with lot of lag they are useless.
Igiss says: Martin, you give them a finger, they bite off your arm.