I think it's good that there is some variation among the reviewers. Having the same score across all reviewers just lowers their credibility I think. Mind you, when there's a big enough difference you have to wonder what the deal is, but I don't think a difference of 1.1 is enough to warrent panic. Mind you, I did think IGN's original score of 7.8 seemed a little overly harsh.
The only teeth strong enough to eat other teeth.