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Not having played the game and assuming what IGN say about the game is accurate, 5 is a fair assessment.
Too many kart games have come and gone since the Super Mario Kart era and none have bettered the genre, only cashed in on it. Reviewers need to start cracking down on these token mascot titles with scathing reviews.
Game mascots aren't held in the same esteem they once were, so games cannot be expected to ride a mascot's coat tails alone.