system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] I know almost nothing about the DC universe, but the idea of Batman vs Superman seems very lopsided. If they're supposed to fight, how does Batman even think he has a shot?

It's like me vs my 2 year old nephew.
gpt
I think you're not giving Batman enough credit. He may not have any powers, but that doesn't mean he's completely useless. After all, Batman has a reputation of being one of the most dangerous individuals on Earth, and there's a reason why he has such a reputation. 
 
To put it into perspective, Batman is the guy who, without superpowers or magic, was able to become part of the exclusive Justice League. This is the guy who has outsmarted gods like Darkseid, fought with aliens who could obliterate the world on a whim, has defeated Dracula, and always comes out on top. And its always due to one simple thing: Batman is willing to do anything to win*.

Sure, Bruce Wayne is just a mortal man, but he is the epitome of the human spirit. He fights against the odds, and fights to win. Batman is not fair, nor does he fight clean. He is willing to fight dirty and exploit any weakness in his opponents to come out on top. 

This is why Batman can fight Superman and stand a chance. Not because they're on the same level of power; Superman exponentially outclasses Batman in strength, stamina, and speed. However, Batman doesn't allow his opponents to use their strengths against him. Batman drags his opponents down to his level, and fights them with cheap tricks and exploiting weakness.

In Superman's case, that involves a lot of krytonite and misdirection. Superman is used to being untouchable, and Batman knows it. As a result, any actual harm that comes to the Man of Steel will result in surprise, giving Batman another advantage to exploit. Krytonite and a way to disable Superman for a time is all Batman needs to defeat Superman, and knowing how Batman thinks, he's already prepared for this contingency.

*Anything except murder. Despite his drive for victory, Batman always holds himself above killing his enemies. This is, in part, due to the fact that Batman knows that if he stooped to killing, he would be no better than the criminals he fights every day. This actually makes Batman's effectiveness even more impressive, as he has accomplished all his achievements without killing any people, even if that would make his goals easier to meet.