Review scores are stupid anyway and those that put too much faith in them are stupid too. They are essentially and attempt to mathematically explain someones opinion, a thing that is intrinsically subjective in its value and even its interpretation. To some a 10 is perfection, while to others it is more like acing a test. The whole thing is just stupid.
Anyways, this happens whenever anyone didn't automatically start drooling over big budget titles. I remember Uncharted 3 being particularly divisive when a "not perfect" score came up.