I don't think you can say that with total certainty.
This could almost be the topic of Brian Cronin's "Abandoned and Forsaken" columns but even while Stan Lee was still writing and editing there was a shift that started to take place in how Doom was portrayed, starting with Doom's first solo story in MSH #20. The arc with the Overmind in Fantastic Four was one of the last that Stan scripted/plotted with Archie Goodwin after Kirby leaves for DC. Sue sort of shames him into leading the FF against the Overmind when Reed comes under his thrall. When it came down for a showdown, Doom was left to fight off the Overmind alone and it's a surprisingly heroic stand. This is also the era when Doom got his own solo in Astonishing Tales, where we also get Gerry Conway's story that introduces the annual ritual where Doom fights for the redemption of his mother's soul. To be sure, Doom does go back to being a straight up villain many times since but then you will also get stories like the follow up to Conway's story in Roger Stern's GN Doctor Strange/Doctor Doom: Triumph and Torment.
Fast forward to present times and we have a sort of reborn Doom who says he's changed and is working alongside a reluctant and doubting Tony Stark. With Secret Wars, Hickman gave him a shot at redemption that Bendis has followed upon in Invincible Iron Man. It remains to be seen if this will be a permanent shift. And right now everyone in the MU owes him for preventing the Beyonder's plan from being successful.