Mr. B Natural said:
Right, but if they expected rave reviews, they probably would have opted for the 1-2 week hype-building run of amazing journalistic hyperbole before the big release date. If they don't expect great convincing reviews, then they probably want to wait and hold them back as long as they can. It's not impractical for some people here to be suspicious of release date embargoes, but not embargoes, in general, that last up until a week or so before the game is out.
Marketing is all about the hype and these days hype is all about getting people excited for release day. Holding back reviews up until release date isn't going to do anything for that hype. Maybe after, but by then, it's too late and the inevitable downward exponential sales curve will already be in effect.
But again I'm not really disagreeing with you. It is up to the marketing department to decide when, where and why reviews come up. It's a question of motive and it can easily be construed as suspicious, especially when similar tactics are used in other forms of media... movies being the most obvious parallel.