You'll get reviewers in a few categories.
One would be the likes of IGN, GameSpot, etc - I'm pretty sure they get their review copies comped, so while they'll see most popular games cross their desks, you have to wonder a bit about the objectivity, as sometimes your only hint that a game isn't good is the lack of enthusiasm in their voice. They try to say how a game is fun, but it really isn't.
Another is the average person, either they're a serious gamer who likes doing reviews, or just someone who has bought the game. Either way, you'll usually research a game before buying it, so odds are you'll be happy with it. There won't be many negative reviews coming from someone like this either.
You'll get a hybrid of the two - someone whose job it is to review games, and that off-sets the cost of paying for one, and they'll be a bit more likey than the previous two categories to give a negative review, but they're sometimes a bit too harsh - since it's hard to find negative reviews, and you're in a situation where an 8/10 is a pretty bad insult from somewhere like IGN, people value the few places where you do see negative reviews, but they'll often critique it for something that has nothing to do with the game, like not living up to what previews and concept trailers showed.
It makes it really hard to actually find good reviews, when most of them are positive either due to obligation or the tendency to buy games you know you'll like, and on the flip side, sometimes the criticism for even the smallest things gets blown out of proportion, in some effort to compensate for the overly positive reviews.
One would be the likes of IGN, GameSpot, etc - I'm pretty sure they get their review copies comped, so while they'll see most popular games cross their desks, you have to wonder a bit about the objectivity, as sometimes your only hint that a game isn't good is the lack of enthusiasm in their voice. They try to say how a game is fun, but it really isn't.
Another is the average person, either they're a serious gamer who likes doing reviews, or just someone who has bought the game. Either way, you'll usually research a game before buying it, so odds are you'll be happy with it. There won't be many negative reviews coming from someone like this either.
You'll get a hybrid of the two - someone whose job it is to review games, and that off-sets the cost of paying for one, and they'll be a bit more likey than the previous two categories to give a negative review, but they're sometimes a bit too harsh - since it's hard to find negative reviews, and you're in a situation where an 8/10 is a pretty bad insult from somewhere like IGN, people value the few places where you do see negative reviews, but they'll often critique it for something that has nothing to do with the game, like not living up to what previews and concept trailers showed.
It makes it really hard to actually find good reviews, when most of them are positive either due to obligation or the tendency to buy games you know you'll like, and on the flip side, sometimes the criticism for even the smallest things gets blown out of proportion, in some effort to compensate for the overly positive reviews.