Satoko said:
Sure create that game then see how many that chooses their favourite character (assuming it's one of the underpowered ones) over one that is overpowered.
Most people will favour the overpowered ones since they are stronger. Why else would pretty much all fighting games have character tiers?
Fact: Having a selection of powerful characters and the other being cannonfodder does not make a good game.
Just depends on your taste then. I know some people who would look at playing the underpowered ones as a challenge and a "test of their manhood" while most would go for OP.

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