I have always been dubious about the reviews published in any official platform publication, especially if it is a game that has been developed either by the console's manufacturer or any of the dev studios they own. They rely too heavily on hype and hyperbole to increase sales of said games and further their own format, yet understandably so. Microsoft poured a shitload of cash into developing Halo, so of course they're going to pay people to bum it!
The thing about game reviews is that is is based on the opinions of the person reviewing the game. Obviously, any journalist reviewing a particular game has to be as objective as possible, but the final outcome will always have a personal tinge to it. Take a look at Yahtzee and ZP. While I enjoy his reviews, I don't necessarily agree with everything he says because he and I have our own opinions.
Personally, if I'm going to take a game review into consideration before buying said game, I am much more likely to trust a review from a multi-format publication, although I have my own preferences (EDGE magazine, I'm looking at you, you bunch of pretentious arseholes....)
At the end of the day, everyone is entitled to their own opinion, and if it doesn't match those of a game reviewer's, who gives a shiny shite? (EDIT. See above!)