If JK Simmons is gonna be J. Jonah Jameson, the least he could do is wear a toupee.

Personally, this doesn't seem too out of character for Strange. His solo film and his section of Infinity War: The Heroes' Journey show him being a bit childish while also saving the world. And Strange doing the spell could be seen as responsible if the movie carries through with Peter being the reason the spell didn't work. Strange would go out of his way to break the rules in order to help a friend, it seems right.

I also like Peter trying to avoid the consequences of his actions, it really jives with his character so far. I'm not sure how the spell breaking would cause multiverse stuff, but hopefully they'll explain it more in the film.

@Asddddd6 it is true.

I'm not a fan of the argument that Strange has been irresponsible before so would be again. The point, to me, is that he's learned from being irresponsible in the past. The Doctor Strange of Infinity War would never act like this.

It’s so good. It had Doctor Strange, funny jokes, Electro, Green Goblin, and Doc Ock. Can’t wait for the film to come out. It’s going to be a good Christmas this year.

Has he learned though? Sure, he hands over the Infinity Stone and sacrifices himself, but this is also the man who looked looked at Tony and said "Protecting your reality, d**chebag." He hasn't matured much since his accident, he just got more powerful. That Strange would totally do a spell he thinks he can handle (barring Peter's interruption) as a favor for a friend, even if it completely goes against Wong's advice, is totally believable for him.

He's still a bit rude, but he comes across as incredibly sincere and careful with his immense responsibility in Infinity War and Endgame.

That's not how I read it. It could also just be a matter of the stakes. Remember, the spell would have gone perfectly if Peter hadn't interfered. Maybe he was a bit more mature since if he screwed up in Infinity War, half of everything would die, whereas he's confident there are no stakes to this and he'll just cast the spell easily, no consequences. I could totally see that fitting Infinity War-era Strange