For me, the key is not how powerful a character is, but whether or not there is any chance of him losing a fight.
As powerful as Silver Age Superman is, there is sometimes a sense that Lex Luthor could conceivably defeat him (and Darkseid unquestionably could).
As powerful as Goku is, his greater foes are presented as being just as powerful as him, if not moreso.
Nanoha, I admit, has become a bit overpowered in a relative sense. I would have enjoyed StrikerS a bit more if I felt that its villains were powerful enough to pose a serious combat challenge to Nanoha.
So, for me, it's not how powerful the protagonist is, but how he or she compares to his/her enemies.
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