The Necessity of Loss
It has been said that a heroe is defined by his villains. The greater the villain the greater the heroe.
Joker - Batman
Lex Luthor - Superman
Sabertooth - Wolverine
Red Skull - Captain America
Leader - Hulk
Dr. Doom - Fantastic Four
Zoom - Flash
But if the villain never defeats the super heroe then the villain loses it's effectiveness as a character.
For instance: Bebop and Rocksteady (warthog and Rhinocerous) the TMNT villains used to be too tough for all four of them. Too strong, too ruthless. After a while however they became 100% useless.
However if the heroe loses then the villain becomes the one of the most frightening forces in comics and makes the heroe that much more effective.
For instance: When Joker killed Jason Todd it was a loss for Batman that had a permanent effect on Batman's life and further developed the Joker into one of the most lethal villains in Comics. Batman has had many losses against the Joker with small victories. These are important.
Thoughts?