I have to strongly disagree with all the definitions regarding power level and PC optimization.
Munchkinism has to do with respect and fun. The RPGnet definition is faulty too, I would play a Ninja in a Risus Victorian game, and using the inappropriate cliché rules would be entertaining for all.
Whs got it almost right, as far as I am concerned. From a post of mine in
Power-gamers, Munchkins and Min-maxers: What's the difference or is there one?
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Power Gamers like high point levels.
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Min-maxers optimize choices.
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Munchkins exploit weaknesses in the rules.
Only the last one is
inherently bad: by "exploiting weaknesses", I mean twisting the rules beyond their intended scope
to the detriment of other players -- including the GM.