The thing is, Zuko was a misguided guy who literally grew up in a family (Along with his nation) being aggressors that launched a hundred year war and his father had been a very abusive bastard who scarred his own son physically, and mentally before trying to desperately find the Avatar in hopes of being welcomed home;after being banished...Zuko never crossed a line like Azula or Ozai, other than betraying Iroh and even then Zuko felt like shit for doing such a thing not the only parental figure he had besides his mother.
Comparing him to Adam because both were disfigured and bad guys rings hollow, because Adam literally DIES when the SDC mark is revealed but there's not a single follow-up or any information about Adam's past unlike Zuko...Imagine if Zuko died back in Book 1, and we never find out more about his past.
That's what Adam is.