In a thread where people are discussing whether a gun or build is over powered, claims that it is not over powered aren't off topic.
Entirely true.
The gun is balanced, "tuning it" would be an imbalance to the gun.
I would say the issue is more complex than this:
Is the gun relatively balanced in high-level play against opponents who are prepared and aware of existing options for counterplay against the Artemis? I would say
yes, this is the case. But unfortunately this isn't the entirety of the issue.
Is the gun relatively balanced in all
levels of play such that any given ship crewed by an average crew has a decent chance at victory? I would say the answer to this is a
no: when matched against players who have
not mastered the art of counterplaying the Artemis, I think the gun is to effective for the amount of skill required
to get basically functionality out of the gun. In other words the
skill ceiling is fine (when mastered the gun is powerful, but opponents with equal mastery can outplay it), but the
skill floor is to low (e.g. the gun is too easy to use for the devastation it can wreck on unorganized or relatively inexperienced teams, even when used by inexperienced players).
So I don't think it needs a nerf so much as it needs some tuning to make it a little easier for less experienced players to handle. This could be a reduction in its ability to aim downward (preserving damage, missile speed, and horizontal arc at the expense of requiring more careful piloting for full effectiveness), reducing horizontal arc (requiring more piloting skill to achieve the desired trifecta), turning speed (requiring more awareness of ship movements from the gunners), or even reducing the splash radius (rewarding precision shots over blanket damage).
All of these changes are, of course, purely hypothetical. The idea is not to take raw power away from the gun, but instead raise the amount of skill needed to reliably get the full effect from the weapon. Tweaking the missile speed/gun arcs/turning speed all accomplish this without significantly reducing the guns deadliness in skill hands.
Would it be a nerf? Yes, ultimately. But a relatively small one and, if the gun can be tweaked to require a bit more skill to use effectively, then perhaps that effective use could receive an equally small buff in exchange.
A NOTE TO SKILLED ARTEMIS USERS: I am not saying the gun is
easy to use, nor disparaging the skills that you definitely have with firing the weapon and positioning your ship to take advantage of the gun's power. I
am, however, saying that it is one of the guns in Guns of Icarus that is the easiest to get powerful, hard-to-counter results with at
low levels of play, which means that the skill floor is to low for a gun that also has such a high skill ceiling. Something like the Gatling is easy to use...but doesn't really have the same level of mastery. Something like the Lumberjack is hard to use...and amazing when mastered. The Artemis currently just has the best of both worlds, which I think is where the issue lies (in my mind).