Originally posted by JakeTheBank
It's not plot based stupidity. It's Superman not using his speed in the way people think he should. Thor not using exotic means to beat Hulk is also CIS, not PIS. Thor chooses to fight Hulk on his level.Even when Superman fights people "on his level", he still doesn't use his speed like people are convinced he should.
If Thor states he's fighting down to Hulks level, or it's implied, that's CIS, because it's the character choosing to restrict his performance.
That's entirely different than a character simply not using a power, or restricting it's use, because it would end most fights in one panel. Flash is a staple example of this, as there's no excuse why he doesn't simply end his fights against Captain Boomerang or Captain Cold right away, except to service the plot.
And Superman does have examples of using his powers the way fans think he should use them. Against Lobo in Eclipso: The Darkness Within, against Cyborg Superman in Trial of Superman, against Mongul in Imperiex Saga and Infinite Crisis..
He does it rarely, but there's no real reason he can't do that on a comic board, as there's no indication he purposely restricts his powers.