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I think there is some bias by reviewers. When it looked like SMG was going to take the top spot, some low scores came out to keep it from happening, etc... A few probably see this as the best chance to get something for the 360 or PS3 into the top spot, and decided to boost the score all the way to the max.

That said, there are enough honest revewiers out there that it might be getting an artificial boost, and some nintendo games getting an artifical lower, but I am sure it averages out to less than one point.