Kirby's foe Meta Knight appears in Super Smash Bros. Brawl, and quickly picked up a reputation as the best fighter in the entire game, to the point that some view him as overpowered and therefore unfair. His primary attack includes using his sword, Galaxia, and due to the ridiculous speed of the attack, caused Meta Knight to be banned from the game's professional community as of 2012.
Players still argue years on about whether or not Meta Knight is "broken", but the salient point is that he was not designed in a fair and balanced way, allowing whoever picked him to trounce their opponents, as long as they knew remotely what they were doing.
Regardless of the controversy, he's a brilliant character skills-wise, even if he may be totally unfair in the grand scheme of things.
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