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I'd say the core of the problem is that it's much too easy to make dummy accounts on Metacritic. A CAPTCHA would curb this so much.
IMDb does it one step further: in order to rate a movie and have it count toward the overall user score, you have to have rated a certain number of movies in the past and have that account remain active for some period of time. Last time I checked, the number of movies was in the triple digits and the active time for the account was several months. IMDb has been the victim of review-bombing (and review-boosting) in the past, most notably with The Dark Knight. Fans of that movie review-boosted it until it reached #1, causing fans of The Shawshank Redemption, the previous movie at the top, to review-bomb The Dark Knight to get it off the top spot.