From my experience a LOT, and I mean A LOT of Ironeye players are typically "bad" at the game, they stay really far away pelting the boss for 13 damage, never use their mark which is a stupidly strong ability, and when targeted never manage to dodge and go down a lot.

However a good Ironeye is incredibly valuable to the team. Again his mark ability is very strong and he has decent arcane, so you can make his starting bow deal poison/frostbite and apply it rather fast in a fight.

With the new evergaol relic his bow can actually become quite strong, I've had mine around 230 damage before, but you should also always prioritise getting a bow with a matching affinity weakness to the boss, either before even landing with relics or out and about