Especially since day-one reviews are notoriously untrustworthy. The reviewers either play the game in haste to make the release date (sometimes not even finishing the game) or in some cases the games are played under ideal conditions (sometimes actually in the developer's studios) not is not representative of the customer's experience. In either case, the accuracy - if not honesty - of the review is in doubt.
I'm far more trusting of a review that comes out a week or two after the game's release than any review released simultaneously with the game; at least it gives the reviewer time to properly play the game. Day-one reviews have no real advantage to the consumer; they are all about increasing sales for the game's developer (by increasing market awareness of their product) and the website/magazine's publisher (by attaching themselves to a popular product). Any consumer who is that eager for a day-one review of a game is probably going to buy the game regardless of what the review says anyway.
So in addition to waiting a week or so before buying the game, wait a week before seeing what other people think as well. You'll get more honest opinions less manipulated by pre-release hype, and will be better able to judge whether or not to spend your money on the product.