I agree with you, Zane...a lot.
Are these forward Gattlers the stock variant or the SuperGattler on the Solaris? The former is going to kill you, but the latter is going to kill you faster, and I think thats a distinction we need to make here, for Destiny's sake 
Either way, wonderful amounts of Dakka on that little boat.
For my sake...? Nah, you don't have to...because it's my playstyle to go full power maximum destruction. Salute me if you would, but you should salute the ship because my Trebuchets will knock out the forward guns while I go BOOSTO with all guns blazing to Maxim range.
The black ops Custos is shielded and can fire countermeasure swarms, so neither Maxim nor Treb would be very effective.
That's quite a problem, isn't it. If there was only a 16-gun Morning Star-er in R2...well, depends on the regeneration rate of the shield, perhaps. Although, since the Custos is that epic, it's worth the wait to go charging head-on at it in the tech room. Hope it appears in many missions!
*complains to GTVI to make swarm Trebs*