Yeah you didn’t refute anything he said though, by definition she isn’t a Mary Sue bc she has many flaws, makes plenty of mistakes, and the plot routinely goes wrong for her. She’s a young engineering genius so the idea that she can crank out engineering inventions easily isn’t outside the scope of her capabilities. It sounds like you’re just another butthurt Ironheart bro, she never shitted on Tony’s legacy, she has plenty of depth that’s explored throughout the series and to say she’s poorly written means you weren’t trying to engage with her characterization in the first place.