"Speaking to IGN, Starlin said he was "amazed" and "flabbergasted" by the events of Endgame. "The up and downs that you have on it. There's some really heartbreaking moments mixed in with a lot of really funny little instances here and there," he explained.
Thanos is killed twice in Endgame; once by Thor, who lops his head off, and a second time--for good--when Tony Stark wields the Gauntlet and snaps Thanos out of existence. Starlin remarked that he was particularly impressed by the way actor Josh Brolin performed Thanos's final moments, when he accepted his fate and sat silently, awaiting his doom.
"His final moments in the movie I think are just priceless," Starlin said. "His demeanor once he realizes what's happening, I think that's just one of those little moments in film that everyone is gonna remember. It's like acceptance and taking it like a man, you know? I thought that was perfectly played."
Also in the interview, Starlin said the character Gamora in the Marvel movies is above all the closest representation of what he created in the comics.