Jranation said:
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Yep, Metacritic is a weighted average (though a fairly subtle one). They add slightly extra value to sites based on their popularity. If IGN and Gamespot are going to be added late though, it's not likely they'll produce a 'huge shift'. The bonus weightings are overall fairly small (at least from what I've been able to tell through averages), and they'll both likely end up giving scores relatively close to the average. At most they might push it 1 point up or down, depending how close to the line the present score was and how many reviews were already in.