It really is the perfect plan. Let the players figure out the ins and outs of breaking a build, then add your own touches. If enough of your players are into making overpowered characters, you can build your own team of psycho rangers while hardly lifting a finger.
Seriously. Do it properly and they'll thank you. Imitation is the sincerest form of flattery; the match-up just has to be "Fair enough for a boss fight". Assuming their counterpart is a boss. If you make him a mook, they... uh... may take issue with that. >.>
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