Castellan is broken in that he is near unbeatable at 2 turrets, which doesnt even take long to set up. Nothing but a top DPS with support can take him out. Let me put it into perspective. Even a Ronin min max setup struggles to take him out with as many as 2 support members boosting him. Let alone Dog or any other heroes who only have very short damage bursts which def cant break through Castellan’s insane def in that short a time while his Silver and Bronze effectively loop endlessly, keeping his Gold going endlessly which in turn keeps his shield going endlessly.
Add to that, when building 2 turrets in the same spot, one turret is basically shielding the other.
I.e., you have to break Silver shield, destroy 1 turret to get to 2nd, damage/destroy 2nd turret to disable endless Gold shield before being able to damage Castellan, who by then would have already thrown up another turret and Silver shield by then which activates Gold again and on and on.
Or you could go the direct route and go for Castellan directly, plow through Silver shield, plow through Gold shield for a few seconds and slowly chip away bit by bit at his HP in the few seconds before the Gold reactivates endlessly. The former is actually more effective in my experience but either way, both are completely ridiculous for a single character. The whole process is just as long as what one would have to consider taking out a full healer/revive team! And he’s just one man! Isn’t that ridiculous? If that isn’t broken to you, I think it’s clear you’re speaking out for your own benefit.
It’s quite clear the devs didnt consider his Gold giving Castellan DOUBLE shield protection apart from double DPS (when having double turrets) in their release note update when they just stated they wanted to give him more dps. His Gold was reasonable when he only had a 1 turret limit. Then they changed that by upgrading his turret limit without considering the way the others skills were designed around his original build in the first place. If you want to keep 2 turrets, the Gold def needs to be debuffed and/or Bronze/Silver charge times need to be lengthened.
He is def broken. Too easy to set up and almost no counters when fully set-up apart from a power advantage over a weak Castellan or ganging up on him (i.e., fortunate to kill the rest of his team quick).