Prove me wrong.

It starts with the fact that DC and Marvel universes, from conception, are fundamentally different. DC characters are more grandiose, while Marvel characters were always based is pseudoscience (however contrived). There's nothing "epic" about Marvel heroes, there all people with glaring flaws and live in a universe that reflects that. Also they were created with a shared universe in mind (minus Golden Age), unlike DC where you have a whole bunch of solo characters thrown together in a universe.

That's why DC characters work so well in tv and especially in cartoons, because they fit those mediums better. Marvel can work in live action tv and movies because their brand works there.

This explains why outside of Batman, DC is having a hard time making their characters work without radically changing them in live action.