@heatforce: The reason it makes sense is because Thor's power during Endgame is internal, all of his power is drawing from himself. Mjolnir was just a tool, a powerful weapon when he picked it back up again, but it still contained a massive amount of power that he had used before, and thus when Cap picked it up, he tapped into that power, the power of Thor, a power Thor had learned to utilize without the hammer.
@slacker_the_hacker: An important clarification, is this before or after Hercules became a god?
If it's before it's more debatable. I imagine if we're including Hercules' most bullshit feat of strength we should include Superman's at which point... it's almost a contest. I would still put holding up the entire heavens above anything Superman has done, ever. Then if we consider it from its less bullshit perspective (Holding up the power of Ouranos from mating with Gaia once more) then we have to consider Ouranos' power and strength in which he overpowered the Earth itself (Gaia) and forced himself upon her. Then again, this is Greek Myth sooooo take it with some very liberal interpretations.
As for the speed argument, I've pointed this out before, but bricks take out speedsters regularly. It's pretty silly to act like they don't, especially if Superman is close enough to get caught in a grapple, he ain't using his speed once that happens.
If it's after, Hercules, no contest, the Greek Gods are ridiculously powerful with straight-up reality warping powers and are, to a point, nigh-universal in terms of power.
I back taskmaster due to gear but people are exaggerating. Cap's held his own and even defeated taskmaster in the past.
Indeed, honestly speaking when it comes to powers and abilities, Cap should win this, everything Taskmaster can do, Cap can do. He has the same kind of photographic memory and automatic learning capabilities. He mastered how to fight in Zero G when Kang said it took decades to master it, and he has the stats on top of it.
Spartans, particularly book Spartans, have incredible feats of strength, accuracy, agility, reaction time etc. with and without Mjolnir armor. But in essentence they're Cap inside power armor with energy shields. I don't see them having any way to take down Hulk, Thor, or Vision and potentially Stark would give them grief as well. Depends on if their weapon can crack his armor. He also has flight, and they don't.
The fodder Ultron bots and street level MCU go down, though Spartan supersoldiers vs. MCU Cap would be interesting.
Yeah, Thor, Hulk, or Vision could solo all the Spartans regardless of prep