He’s the best of his class, but Iron Fist’s L1 has low damage and really only pairs well with Black Widow (they both have unarmed moves that can play off each other). He never gets ranged attacks, just close-up melee.
On the plus side, his ability to heal nearby characters comes in handy and suits many players’ play styles. His L6 attack is a decent AOE. His lack of ranged moves keep him out of the top tier hero list, but if you’re in need of a Scrapper or want a good but inexpensive hero, Iron Fist is a good choice