Frankly, compared to "mere mortals", superheroes are overpowered by definition. Against one another, it becomes a different story. If superman has a nemesis that he can only fight to a draw, is he then "overpowered"? I would tend to agree w/you about Thor. If he is a god (small "g"), then he should win over superman who is not, or at least more often. I suspect logic isn't always a strongsuit in comics as they are fantasy driven for most part. Never really got into whole superhero thing, so maybe there's somethings I've missed, but that's where I stand on what I know in general.
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