Because Mjolnir was in Hell, its enchantment was weakened and allowed the great Doctor Doom to pick it up and fight his way out of his prison. So he wasn't necessarily worthy by any means because he was still his usual egomaniac self.
Doctor Doom was able to finally wield Mjolnir after the hammer fell into Hell. There, the weapon's mystical protections were diminished enough for the ruler of Latveria to use it to escape his hellish prison.
After saving the world, making a play to sacrifice himself, and defeating Thanos' army, he was not able to lift Mjolnir in Age of Ultron. This shows that being a hero and doing occasional good deeds does not make you worthy. Tony wasn't a bad guy per se, but certainly not his best self yet.
Banner is at war with his Hulk persona, with this inner conflict making his soul too confused to prove worthy. Unable to make peace with a key part of himself, he's denied worthiness in the side of himself that he likely felt would be undoubtedly worthy.
Deadpool and Olsen were both transported to Loki's headquarters where Olsen was kept captive in the same chamber that Deadpool was in the above pages and they all learned the charade, as Loki created a fake version of Mjolnir and disguised the real Mjolnir, thus making Olsen/Thor believe that the one that Deadpool ...
After bashing Thor with an entire stone pillar, Juggernaut managed to separate Thor from his hammer – but was unable to lift it as a selfish brute like him was unworthy of its power.
It's important to note that the rules around worthiness had been temporarily suspended to allow this to happen. As soon as the fight was over, Superman couldn't lift the hammer anymore. However, under normal circumstances, without any weird interference, Superman is worthy of Mjolnir.
The simple answer is no. Yes, Hulk absolutely smashes Thor to the ground with Mjolnir, but, he's holding both Thor and the hammer. Hulk wouldn't have been able to lift Mjolnir by himself, but since the God of Thunder had a firm grip on it as well, he was able to use it as a weapon against his teammate.
Stormbreaker has the additional power to summon the Bifröst, allowing Thor to teleport anywhere in the Nine Realms. Screen Rant has identified Stormbreaker as the more powerful of the two, based on this ability, as well as it being a much larger and edged weapon.
While the primary Thanos from Earth-616's universe was defeated and was never worthy to lift Mjolnir, it's possible that a future (or existing) variant of Thanos could.
The MCU Set Up Captain America's Worthiness In Multiple Ways
So much of Steve's first adventure was about proving to everyone that he possessed heart, compassion, empathy, and courage in a way normal men do not. This alone is enough to set up his worthiness by the time of Avengers: Endgame.
Joss Whedon is well known for his geeky Easter eggs. You could argue Mjolnir shifting for Captain America was a nod to a time when Rogers was indeed found worthy. So, maybe Natasha didn't want to look like a fool struggling to lift Mjolnir. Or maybe she just didn't want to deal with the costume change.
Doom holds the two most heroic weapons/symbols of the Marvel Universe: Captain America's shield and Thor's hammer. Only a few characters have ever wielded the hammer in Marvel Comics - and fewer still have held both hammer and shield - so the fact that a ruthless dictator can lift Mjolnir is quite shocking.
Even though, Bill was able to hold Mjolnir because of his worthiness but Mjolnir will rip Bill's arm off if he didn't let it go. So, Mjolnir will prefer Thor over anyone.
Other Marvel characters have lifted Mjolnir not through worthiness but through technicalities such as absorbing Thor's powers, including the Air-Walker, Awesome Android, Magneto, Rogue, Wonder Man, and Doctor Doom.
In the end, Deadpool wasn't worthy. While he seemingly had control of Mjolnir and the strength of Thor, it was all a mirage put on by Loki to distract Thor.
Superman could wield Mjolnir because he is, at his core, one of the purest heroes in the DC universe. In fact, Superman has wielded Thor's hammer before.
While the Peter Parker Spider-Man we all know and love cannot lift Mjolnir, Spider-Man 2099 can. Miguel O'Hara winds up with Mjolnir after a long series of events that lead up to 1997's Manifest Destiny, an event comic that wrapped up the 2099 universe.
Thanos and Hulk have clashed several times in Marvel lore, with Thanos even admitting he was scared to face the Hulk before acquiring the Infinity Stones. While Thanos is usually the victor, it's generally down to him using superior tactics and technology, rather than simply possessing greater physical strength.
Summary. Bruce Banner's failure to lift Mjolnir in Avengers: Age of Ultron proved that he wasn't worthy during the MCU's Phase 2. The Hulk's betrayal in Avengers: Infinity War suggests his selfishness and resentment may have been holding him back from wielding Mjolnir in Age of Ultron.
Mjolnir is not particularly heavy, it weighs 42.3 lbs. The fact that almost no one except Thor can lift the hammer has nothing to do with it's physical weight. The hammer is enchanted so that only those deemed 'worthy' are able to wield it.
It depends on which type of vibranium you are taking about. Vibranium in wakanda can be broken by superman until an unless suri full off Tricks to make it more durable. In movies Captain sheild is made of Exclusively Vibranium of Wakanda. But antartic vibranium is much more durable compare to his othe…
Thor is the far stronger character. I don't see Aquaman surviving Sokovia exploding, or getting punched by Thanos and Hulk, especially since his durability seems to max out at city block level. Aquaman is pretty strong, but Thor is definitely stronger. Aquaman is pretty strong, but Thor is definitely stronger.
Aside from enhanced strength and speed, Cap also gained enhanced reflexes — enough to dodge bullets from point-blank range. While Batman, though more reflexive than an average human, just wouldn't cut it in the reflexes department. In a Batman vs Captain America reflex-combat, America would take the win.
