I enjoy what they do with fictional physics for the most part. When they tweak reality without going overboard is when it's best imo. The type of stuff that I can't get with is superman getting beat or batman being invincible ect...
If he can punch at the speed of light, that's a tremendous acceleration, then taking into account his mass which would have to be extremely dense. That's an incredible amount of force he is hitting with. We could have fun calculating how far you would fly on earth, if you were wearing vibranium and he hit you as hard as he could, and answering questions like does his punch have more force than Thanos used to pull the moon out of orbit is also interesting to me.
However when guys like that get beat by batman it's hilarious. Superman may be able to knock you clean off the planet, or at least some planets, if you do the physics. Then what? Keep fighting him? LOL