Originally posted by Allankles
That's because Supes is a......(wait for it)....a hero. What super hero do you know is written to be above every top tier? Also, putting Thanos' history into perspective and ignoring the fact that he's a copy of a god Superman has curb stomped several times, he's abilities are not properly defined.And that's mainly because almost every impressive thing he does is nothing but a plot device. If a sensible writer/s handle this hypothetical fight Supes IMV has a fifty percent chance of beating Thanos.
There's also the fact that Superman has inexhaustible energy of the God wave to increase his abilities, Thanos won't have gone up against a character with this level of speed, durability and strength. I say Superman potentially wins 4/10