I agree Arty is damn near perfect when mastered. I have 90 hours with Arty at the moment and I average about 15-20k in Objective games. Some really good drawn out objective games you can easily push out 28-30k if you have a good medic keeping you in the action all game. I think my highest ever game with Arty was 56k in a Stopwatch game that was drawn out to 29 minutes. His mains are incredibly strong, his airstrikes are pretty verstaile with cross map range and he has infinite ammo. What more can you ask for.
In fact I was incredibly surprised when… I think it was 2-3 streams ago, Faraleth put up his notes and it said something along the lines of the devs were considering giving him some kind of indoor ability as well to balance him out with Skyhammer since his marker can be used as a grenade indoors. Arty is already so strong, it seems stupid to give him more if you ask me.
Which reminds me, I intended to start a conversation regarding Airstrike balance a while ago, but never did it.