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If the game tries to be serious, and pulls it off well, then joke reviews shouldn't be allowed.
Something like Garry's Mod or Goat Simulator are fine having joke reviews, since the games themselves are jokes/parodies more often than not. (Garry's Mod is not a joke, but whenever Garry shows off a new feature, he tries to be funny with it, and most people use it for jokes rather than serious stuff.)