As in reviews from video game review sites, i'm a little annoyed because metacritic has only Eurogamers review of Dawnguard, while there's been 2 other reviews for like 3 hours, eurogamers review is a 7 while the rests are 8's. I already searched it on Google but couldn't find anything

Oh noes! How dare a site not instantaneously update to include all reviews and heaven forbid the one site on an aggregator gave something a lower score

It'll update with other reviews in a little bit There's probably some bias proofreading done before adding a review or something to make sure it's a neutral reviewer.

Ah okay thanks I just don't like eurogamer, they gave MGS4 a 8...

Is it because 8 is too high or too low?

WAY too low.

But isn't it kind of pointless to only read publications that you already completely agree with?

Eurogamer must've had some reasons for giving MGS4 an 8/10. Maybe they have a few good points that would broaden your perspective of the game's overall design.