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According to who? There is more than 1 review out there, so maybe it's just on one or two sites, but there are some decent reviews out for both versions. Its possible that reviewers will put their own bias into some reviews, perhaps the reviewer you are talking about prefers PS3 in general. Or maybe there is something more specific. Did you read the entire review in question or just glance at the score? If you read it, was there anything specific mentioned that makes the reviewr feel that the PS3 version is superior?
Sorry to ask so much, it's jsut that your original post is pretty vague.
The Wii, PS3 and 360 versions of this title are fairly different games, or should I say experiences, both control and graphics-wise, warranting potentially different review scores. The PS3 for example uses the Move controller ofc and has an animated MJ while the Kinect scans and puts you into the picture, leading to very different-looking games.