Why the dragonball syndrome works well with MCU but fails in X-Men?

Last Stand was bad because Jean Grey's powers in the movie were nowhere near as grandiose and huge-scale as they were in the comics. She should be flying around the universe destroying entire planets and civilizations, not just disintegrating a few ground troops.

It would work if the overall quality of the films were better. The bigger threats are built a lot better in the MCU than they are in the X-Men where they tend to be rushed. Just wait til Marvel starts making X-Men films.

The bar never seems to rise much for the X-Men movies, which is part of the problem. There's always a mutant with a plot device power who the bad guys use to either kill all humans or kill all mutants. They haven't moved much beyond Guy With Claws, either. Remember, as powerful as Xavier or Jean Grey were, a guy with claws eventually took the out. Things might change with this movie, but the X-Men films never went into the crazier parts of the franchise such as the Savage Land, or the Shi'Ar Empire. We never got Onslaught and while Apocalypse was pretty powerful, there's a lot of weird cosmic stuff they could have done with the character in his film debut.

MCU does it well because they set it up early on. We were hinted at Thanos in 2012. Plus we were already exposed to god-like beings in Thor. In addition to that they kept adding infinity stones. It works if its done gradually. Since we had already seen other worlds and planets by the time of Infinity War it didn't feel out of place to have Tony and Peter stuck on a distant planet.

This story was huge in comics many years ago.

It had alien superbeings showing up to try to kill her and the climax took place on the moon.

The problem with Fox films is they don't use the source material that everyone loved and they cheapen things up a lot. If they actually used the original stories they would be far more successful.

Marvel films include a lot of original stories elements.

Also, Fox seems to focus a lot on young people as actors. That loses something because most superheroes are adults. People doing advanced science tend to be adults, etc. Having kids play the roles looks weird and many actors that age probably can't imagine the pain and stress of being a superhero, and so their acting is flat.

The Star Wars prequels had that issue with the Darth Vader actor. I could see on his face that he didn't understand the character.

I have to say it bothered me in the marvel movies too. In endgame the big battle at the end is quite stupid: you have some of these heroes clearly waaaaay stronger than others, yet they all fight the same way (meaning, they can defeat the same kind of monsters or face similar resistance from them). You would expect the stronger ones killing the big monsters and the weaker ones killing the small enemies, but no. Or maybe the strong hero killing a ton of small enemies that were a threat for weaker heroes. No again.

Anyway, other than that, they managed to raise the bar because:
1- They have given improvements to the heroes all the time (so, like in dragon ball, the heroes "work out" and become better fighters than before, with higher "power level").
2- They are given trick solutions (in endgame, for instance, they KNOW they need the stones to defeat Thanos, or they would lose with their own strenght because he is stronger than all of them put together).
This doesn't happen in x-men, who are produced by Singer in the same fashion of a kid playing with his toys and having wolverine fight against a sentinel and then psylock comes over and she has a mental sword but professor x uses his powers and.....
That's not very clever writing.