It's ridiculous how people claim Metal Knight has no feats or hasn't shown to be that impressive so far. His feats actually shit on most other S-Classes tbh. With stuff like this crazy firepower. Or other things he's done such as
Imagine if he actually cared to use the fullest extent of all his resources, firepower and technology into fighting a single opponent. TBH I think Metal Knight's only behind Tatsumaki and Blast (if the hype around him is true). Of course that last thing is more speculative headcanon for now, however the fact remains that some of the stuff he's shown capable of is absolutely insane.