I prefer 0-4 stars for rankings. Then people will actually look at the review, instead of relying on a single number to tell them if a game is good or not.
People always complain when a game gets a "perfect score" on 0-10 or 0-100. Or if a site give a point lower than the average on their favorite game, they are up in arms. People need to get past the numbers and read the reviews.