tombi123 said:
1) Umm... My A level in Mathematics (part of which was statistics) says 30 is the bare minimum. It is irrelevant whether this game will get 30 reviews or not. 30 is still the bare minimum. If the game doesn't get 30 reviews, it just means the average is very unlikely to be representative of the general public (gamers) as a whole. Which makes it a very inaccurate average. The vast majority of averages on metacritic (and gamerankings) are a mathematical joke.
2) 90 from the next four reviews is unlikely but possible. Of course it could also get 60, 55, 62, 65, from the next four reviews, bringing the average down.
I think it deserves to be ahead of the 360 overlord, because it comes with a free expansion pack, not as buggy etc. It is to early to tell where it will end up though. Again, your use of the word trend is mathematically wrong. I have shown that all it would take is a couple of high scores (anomalies) to put the PS3 version ahead of the 360 version, and anomalies don't make a trend. So it is (far) to early to say how it is 'trending'.
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Well since you started the pissing contest........
1) My major in statistics (not a maths course that has a statistics component, an actual statistics major) in my third year of university says that you would struggle to reasonably apply any statistical theory to the current situation. If you WERE going to then you wouldn't be dealing with 12 reviews. You would be dealing with twelve reviews plus EVERY SINGLE significant correlation and predictor you could find in every single game's (on Metacritic) review aggregate and the way in which every single game has trended after twelve reviews. But unless you want to spend days putting every single game with all of its trending statistics and aggregates into a statistics program like SPSS, or at least hours developing and correlating an appropriate sample of a few hundred games, perhaps we should just leave professional statistics out of this? 
2) "Unlikely but possible." That is exactly my point. Metacritic states that based on the only reasonable indicator, the Xbox 360 version is superior. To use your words, that is "unlikely" to change.
Finally. Any demographical data set can have anomalies, but you have not made any argument suggesting that this game's score is at this point in time, an anomoly. All you have said is that it "could" become an anomaly. That of course, is perfectly true, but in you're own words "unlikely."
Really, unless you want to spend weeks with a full statistics team developing a structure that can give us a more mathematically sound model for charting review aggregates, only to find that its still full of anomalies, Metacritic is the best we have (and arguably Famitsu for Japanese games).