I know the policy is that all reviews are based on the day the game hits the shelves and not after game updates to the games are done. I never really cared about this rule until it effected me. I was looking at getting Sonic Racing for the Wii-U, then I saw the game scored a 6.0. So this had bummed me out until I found out from someone else that the game had an update that fixed the issues that was expected in your review of the game. I understand you may not change your review scores or notes. This would take alot of time, don't forget many people base what games they are going to buy on reviews. It would be nice if it was noted somewhere when looking up a review that there been an update to the game.
I also wonder if this practice is now becomes dated. Many games such as NSMB Wii U and MGS4 require an update before you start playing them. If these games reviews are being based after an update should it be noted that an update was done to a game.