Well, I look at it this way.
You take a movie like Dumb and Dumber. My mom likes to say she hates that movie because "it's dumb." My response is, and always will be, "it's in the title twice. What did you expect?" There's an expectation going in that you're going to watch a movie that is actively going for the lowest common denominator. And you base your idea on it accordingly. There are literally thousands of movies that are better made, better acted, and better done than Dumb and Dumber. But pretty much none of that matters because it's judged on one thing - is it funny? And it either is or isn't.
To me, it's the same with Marvel films. Honestly, it doesn't really matter to me if the action on screen makes perfect sense. If the characters are interacting in a meaningful way. Or if anything that is happening on the screen truly matters. It mattered a bit in Iron Man I, but as soon as Steve Rogers is wearing his ridiculous costume and fighting Loki in some sort of World War II parallel in Germany and Iron Man flies in blasting AC/DC, my brain basically shuts off. "You're watching a movie for children," it says. "I'm going to take a nap."
And to me, that's fine.
DC wants to take itself more seriously. Well, sort of. I watched Superman Returns and Green Lantern in the exact same way I watched a Marvel movie. I see Superman in his bright costume picking up a plane, and I cheer. I see Ryan Reynolds in a cartoon suit fighting a cartoon pig monster, and my brain tells me I'm watching a cartoon. Literally nothing matters.
Christopher Nolan upped the stakes. His movie made you honestly believe that a man would wear a bat costume and run around punching a clown. That sentence is supposed to make no sense, but it does because Nolan made us care about it. That's why Heath Ledger won an academy award for it. He transcended comic book movie and made a really good movie that features comic book characters.
Snyder doubled down on that. Tried to bring Superman into the real world. What would it be like if this man with all these powers was real. And it's realistic. It has weight to it. It's trying to be a real movie. And my brain never tells me it's going away. I watch with my brain activated. And so when I see a building collapse, my brain is there to tell me, "HOLY SHIT, THAT BUILDING IS FULL OF PEOPLE THAT ARE ALL GOING TO DIE." I get 9/11 flashbacks because 9/11 is a real thing, and the aliens from Avengers are fake. Those buildings are empty because people don't die in cartoons.
So if you want to compare character development between Marvel and DC, I ask you to compare Dumb and Dumber and A Few Good Men in a way that's meaningful. You can't do it. Lloyd Christmas isn't real. Lieutenant Daniel Kaffee is real.
People freak out about the deaths in Man of Steel because that movie made us care. Avengers doesn't really want us to care. What's funny is that people like to compare the Battle of New York to the Battle of Metropolis. But there was another movie that came out in 2013 that people never talk about.
https://www.youtube.com/watch?v=cJ9VMaNRF4s
How many people die in that scene? The Vengeance flies into what's clearly shown is a busy city in broad daylight. It *completely* demolishes a half dozen skyscrapers. Maybe more. Every single person it shows is killed - no doubt. Every person in those buildings is probably dead. I'd say more people die in that scene than Avengers and Man of Steel combined.
But no one cares. Because Star Trek Into Darkness made it very clear from the beginning that it's a dumb movie that you don't have to care about.
In movies like Dumb and Dumber, you either think it's funny or not. That's all that matters. It's why Dumb and Dumber is a classic and Dumb and Dumber To is a disaster. Same qualifications - one is good, one is bad. Marvel movies and Star Trek movies and Independence Day movies and Ninja Turtle movies and Transformers movies usually only have one question - did you have any fun? Avengers yes, Star Trek Into Darkness sorta, Independence Day yes, Transformers 2 and 3 no.
But when you make a Man of Steel, when you make a Dark Knight, when you make a Batman v Superman, you're ditching the bright and colorful costumes and the one-liners and the gadgets and the goofiness. You have emotional weight. Bruce Wayne actually has to work out to win a fight. When buildings collapse, there's a guy in that building praying that he'll go to heaven. A guy loses his legs and loses his hope and suicide bombs a room full of people.
And there's even proof of this - people hate Iron Man 3. It's a movie that features very little Iron Man and chooses to focus on Tony Stark. He isn't laughing or joking around. He's suffering from panic attacks. His friend ends up in the hospital. The villains are scary and powerful, and Tony is constantly in danger.
Iron Man 3 is clearly a better movie than Captain America: The First Avenger. It's a better movie than Avengers. But people don't like it as much (Rotten Tomatoes has higher ratings for both those movies). I think it's because people try to compare it to other MCU films, and it doesn't gel. They're too different. One wants you to care about Tony Stark the character isn't of Tony Stark the one-liner machine. Your brain stays on too long and asks too many questions. You realize the Mandarin bait-and-switch is stupid even though it's a median-stupid thing in the MCU. He's just as ridiculous as Mickey Rourke's character in Iron Man 2. You realize it's reckless for Tony to give out his home address to a terrorist in IM3 but never thought it was ridiculous for Tony to race in a Grand Prix or throw a nuclear missile into space.
Because Avengers is dumb. Iron Man 2 is dumb. But Iron Man 3 tries to be smart. "Is it fun?" no longer is the only question to ask. There are more questions to ask, more thinking to be done, more things the movie has to accomplish.
And one of the better movies in a franchise becomes one of the lesser liked movies in a franchise. Because it dared to cross that line that takes you from a movie to a film. When you make a movie, we'll forgive a lot. Just let us feel like you deserve our $10. But films? Films make us think. Films make us believe and question and wonder. Films win awards. We hold films to a bigger and better standard. And that's why I don't care when the USS Vengeance crashes into San Francisco. Or when a giant dragon ship crashes into a building in New York. Those are movies. Movies are supposed to be fun, and they're supposed to be dumb.