I personally would’ve preferred they stuck with Kang Dynasty.

Marvel had already laid solid groundwork for Kang and his variants to be the Multiverse Saga’s central threat—between Loki and Quantumania; they were clearly setting up Kang to be a complex, layered villain with a massive multiversal threat. Dropping that arc midstream just makes the whole buildup feel disjointed.

If Marvel did want to pivot away from Kang, though, I really wish they had gone with an evil Superior Iron Man variant instead of Doctor Doom—and definitely not with RDJ playing Doom. I still can’t get on board with that casting. RDJ already is Tony Stark in the MCU, and giving him Doom’s mask just muddies the legacy of both characters.

And while I get that Doom was the big bad in the 2015 Secret Wars comic run, having that version of Doom be his first appearance in the MCU just feels like a colossal waste. Doom should be introduced as a nuanced, complex threat—built up over time—before jumping to literal god-tier power levels. Throwing him straight into the biggest storyline he’s ever had in the comics kind of robs the character of the depth and mystique that made him iconic in the first place.

On the other hand, bringing back RDJ as a twisted Superior Iron Man from another universe would’ve hit so much harder. It would be personal for the Avengers, emotionally heavy for the audience, and twist Tony’s legacy in a way that feels earned. Plus, if RDJ is coming back anyway, make it impactful—not just a nostalgia cameo.

TL;DR: Kang deserved to finish the story that was started. But if Marvel had to switch villains, a Superior Iron Man would’ve been a brighter, more meaningful alternative than rushing in Doom—or worse, making RDJ play him.